Reviewed by Sam.
- <rdar://4516170> Back/Forward Cache on Windows * WebFrame.cpp: (WebFrame::forceLayout): Implemented this. Just calling through to Frame::forceLayout matches the Mac pretty well and should be enough for now. Without this we won't repaint the new page when we go back and forward. (WebFrame::dispatchWillSubmitForm): Use COMPtr's AdoptCOM constructor instead of the adoptRef function. (WebFrame::restoreViewState): Removed unneeded notImplemented() call. This is implemented as much as it needs to be. (WebFrame::shouldGoToHistoryItem): Ditto. (WebFrame::saveViewStateToItem): Ditto. (WebFrame::canCachePage): Ditto, also changed it to return true. This is what was preventing the back/forward cache from running, and there's no need for any additional checks in the Windows version. * WebView.cpp: (PreferencesChangedOrRemovedObserver::onNotify): Fix backwards null check that was preventing this notification from ever being sent, which in turn meant that page cache had a capacity of 0. (WebView::initWithFrame): Removed unneeded setUsesPageCache(false) code. This actually was ineffective and ended up doing no harm, but we don't need it. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@28822 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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