Follow up to https://bugs.webkit.org/show_bug.cgi?id=106144, fixing some
of Alexey's review comments.

* NetworkProcess/NetworkProcess.cpp:
(WebKit::NetworkProcess::downloadProxyConnection):
(WebKit::NetworkProcess::createNetworkConnectionToWebProcess):
* PluginProcess/PluginProcess.cpp:
(WebKit::PluginProcess::createWebProcessConnection):
(WebKit::PluginProcess::getSitesWithData):
(WebKit::PluginProcess::clearSiteData):
* Shared/ChildProcess.h:
(WebKit::ChildProcess::parentProcessConnection):
* SharedWorkerProcess/SharedWorkerProcess.h:
* WebProcess/WebProcess.cpp:
(WebKit::WebProcess::downloadProxyConnection):
(WebKit::WebProcess::addVisitedLink):
(WebKit::WebProcess::removeWebFrame):
(WebKit::WebProcess::getSitesWithPluginData):
(WebKit::WebProcess::clearPluginSiteData):
(WebKit::WebProcess::addPlugInAutoStartOrigin):
(WebKit::WebProcess::plugInDidReceiveUserInteraction):
(WebKit::WebProcess::getWebCoreStatistics):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138875 268f45cc-cd09-0410-ab3c-d52691b4dbfc