Delete Waterstones store plugin

Waterstones UK stopped selling ebooks last year apparently:
https://www.waterstones.com/help/ebooks-&-mp3-audio-downloads/12

src/calibre/customize/builtins.py

@@ -1843,17 +1843,6 @@ class StoreVirtualoStore(StoreBase):
     affiliate = True
 
 
-class StoreWaterstonesUKStore(StoreBase):
-    name = 'Waterstones UK'
-    author = 'Charles Haley'
-    description = u'Waterstone\'s mission is to be the leading Bookseller on the High Street and online providing customers the widest choice, great value and expert advice from a team passionate about Bookselling.'  # noqa
-    actual_plugin = 'calibre.gui2.store.stores.waterstones_uk_plugin:WaterstonesUKStore'
-
-    headquarters = 'UK'
-    formats = ['EPUB', 'PDF']
-    affiliate = False
-
-
 class StoreWeightlessBooksStore(StoreBase):
     name = 'Weightless Books'
     description = u'An independent DRM-free e-book site devoted to e-books of all sorts.'
@@ -1950,7 +1939,6 @@ plugins += [
     StoreSmashwordsStore,
     StoreSonyStore, StoreSonyAUStore,
     StoreVirtualoStore,
-    StoreWaterstonesUKStore,
     StoreWeightlessBooksStore,
     StoreWHSmithUKStore,
     StoreWolneLekturyStore,

src/calibre/gui2/store/stores/waterstones_uk_plugin.py

@@ -1,88 +0,0 @@
-# -*- coding: utf-8 -*-
-
-from __future__ import (unicode_literals, division, absolute_import, print_function)
-store_version = 2  # Needed for dynamic plugin loading
-
-__license__ = 'GPL 3'
-__copyright__ = '2011, John Schember <john@nachtimwald.com>'
-__docformat__ = 'restructuredtext en'
-
-import urllib2
-from contextlib import closing
-
-from lxml import html
-
-from PyQt5.Qt import QUrl
-
-from calibre import browser
-from calibre.gui2 import open_url
-from calibre.gui2.store import StorePlugin
-from calibre.gui2.store.basic_config import BasicStoreConfig
-from calibre.gui2.store.search_result import SearchResult
-from calibre.gui2.store.web_store_dialog import WebStoreDialog
-
-
-class WaterstonesUKStore(BasicStoreConfig, StorePlugin):
-
-    def open(self, parent=None, detail_item=None, external=False):
-        url = 'http://www.awin1.com/awclick.php?mid=3787&id=120917'
-        url_details = 'http://www.awin1.com/cread.php?awinmid=3787&awinaffid=120917&clickref=&p={0}'
-
-        if external or self.config.get('open_external', False):
-            if detail_item:
-                url = url_details.format(detail_item)
-            open_url(QUrl(url))
-        else:
-            detail_url = None
-            if detail_item:
-                detail_url = url_details.format(detail_item)
-            d = WebStoreDialog(self.gui, url, parent, detail_url)
-            d.setWindowTitle(self.name)
-            d.set_tags(self.config.get('tags', ''))
-            d.exec_()
-
-    def search(self, query, max_results=10, timeout=60):
-        url = 'http://www.waterstones.com/waterstonesweb/simpleSearch.do?simpleSearchString=ebook+' + urllib2.quote(query)
-
-        br = browser()
-
-        counter = max_results
-        with closing(br.open(url, timeout=timeout)) as f:
-            doc = html.fromstring(f.read())
-            for data in doc.xpath('//div[contains(@class, "results-pane")]'):
-                if counter <= 0:
-                    break
-
-                id = ''.join(data.xpath('./div/div/h2/a/@href')).strip()
-                if not id:
-                    continue
-                cover_url = ''.join(data.xpath('.//div[@class="image"]/a/img/@src'))
-                if not cover_url.startswith("http"):
-                    cover_url = 'http://www.waterstones.com' + cover_url
-                title = ''.join(data.xpath('./div/div/h2/a/text()'))
-                author = ', '.join(data.xpath('.//p[@class="byAuthor"]/a/text()'))
-                price = ''.join(data.xpath('.//p[@class="price"]/span[@class="priceRed2"]/text()'))
-                drm = data.xpath('boolean(.//td[@headers="productFormat" and contains(., "DRM")])')
-                pdf = data.xpath('boolean(.//td[@headers="productFormat" and contains(., "PDF")])')
-                epub = data.xpath('boolean(.//td[@headers="productFormat" and contains(., "EPUB")])')
-
-                counter -= 1
-
-                s = SearchResult()
-                s.cover_url = cover_url
-                s.title = title.strip()
-                s.author = author.strip()
-                s.price = price
-                if drm:
-                    s.drm = SearchResult.DRM_LOCKED
-                else:
-                    s.drm = SearchResult.DRM_UNKNOWN
-                s.detail_item = id
-                formats = []
-                if epub:
-                    formats.append('ePub')
-                if pdf:
-                    formats.append('PDF')
-                s.formats = ', '.join(formats)
-
-                yield s