De-virtualize RenderViewImpl's commit-time functions
didNavigateWithinPage() is only used by RenderViewTest, which can call directly into RenderFrameImpl::didNavigateWithinPage() to accomplish the same thing.
didCommitProvisionaLoad() should be FrameDidCommitProvisionaLoad() and devirtualized.
This is necessary to allow builds that use -Woverloaded-virtual to successfully compile the next step of moving HistoryController to content/ (https://codereview.chromium.org/
217363005/)
BUG=357327
Review URL: https://codereview.chromium.org/
224713002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261898 0039d316-1c4b-4281-b951-d872f2087c98