Initialize QtWebKit-specific stuff with QtWebKit only

Maybe this fixes issues we had with QtWebEngine segfaults in proxy.py on
Travis?

Note we can't move cookies/cache/network stuff yet as we still need that
for e.g. adblock downloads with QtWebEngine.

qutebrowser/app.py

@@ -47,8 +47,7 @@ from qutebrowser.commands import cmdutils, runners, cmdexc
 from qutebrowser.config import style, config, websettings, configexc
 from qutebrowser.browser import urlmarks, adblock, history, browsertab
 from qutebrowser.browser.webkit import cookies, cache, downloads
-from qutebrowser.browser.webkit.network import (webkitqutescheme, proxy,
-                                                networkmanager)
+from qutebrowser.browser.webkit.network import networkmanager
 from qutebrowser.mainwindow import mainwindow
 from qutebrowser.misc import (readline, ipc, savemanager, sessions,
                               crashsignal, earlyinit)
@@ -399,10 +398,6 @@ def _init_modules(args, crash_handler):
     log.init.debug("Initializing sessions...")
     sessions.init(qApp)
 
-    log.init.debug("Initializing js-bridge...")
-    js_bridge = webkitqutescheme.JSBridge(qApp)
-    objreg.register('js-bridge', js_bridge)
-
     log.init.debug("Initializing websettings...")
     websettings.init()
 
@@ -419,9 +414,6 @@ def _init_modules(args, crash_handler):
     bookmark_manager = urlmarks.BookmarkManager(qApp)
     objreg.register('bookmark-manager', bookmark_manager)
 
-    log.init.debug("Initializing proxy...")
-    proxy.init()
-
     log.init.debug("Initializing cookies...")
     cookie_jar = cookies.CookieJar(qApp)
     ram_cookie_jar = cookies.RAMCookieJar(qApp)
@@ -716,7 +708,6 @@ class Quitter:
             atexit.register(shutil.rmtree, self._args.basedir,
                             ignore_errors=True)
         # Delete temp download dir
-        objreg.get('temporary-downloads').cleanup()
         # If we don't kill our custom handler here we might get segfaults
         log.destroy.debug("Deactivating message handler...")
         qInstallMessageHandler(None)

qutebrowser/browser/webkit/webkittab.py

@@ -26,19 +26,27 @@ import xml.etree.ElementTree
 from PyQt5.QtCore import (pyqtSlot, Qt, QEvent, QUrl, QPoint, QTimer, QSizeF,
                           QSize)
 from PyQt5.QtGui import QKeyEvent
+from PyQt5.QtWidgets import QApplication
 from PyQt5.QtWebKitWidgets import QWebPage, QWebFrame
 from PyQt5.QtWebKit import QWebSettings
 from PyQt5.QtPrintSupport import QPrinter
 
 from qutebrowser.browser import browsertab
-from qutebrowser.browser.webkit import webview, tabhistory, webkitelem
-from qutebrowser.utils import qtutils, objreg, usertypes, utils, log
+from qutebrowser.browser.webkit import webview, tabhistory, webkitelem, cache
+from qutebrowser.browser.webkit.network import proxy, webkitqutescheme
+from qutebrowser.utils import qtutils, objreg, usertypes, utils, log, standarddir
 
 
 def init():
     """Initialize QtWebKit-specific modules."""
-    # FIXME:qtwebengine Move things we don't need with QtWebEngine here.
-    pass
+    qapp = QApplication.instance()
+
+    log.init.debug("Initializing proxy...")
+    proxy.init()
+
+    log.init.debug("Initializing js-bridge...")
+    js_bridge = webkitqutescheme.JSBridge(qapp)
+    objreg.register('js-bridge', js_bridge)
 
 
 class WebKitPrinting(browsertab.AbstractPrinting):