AutoFill: Release the cached frame when we receive the frameDestroyed() message
from WebKit.

BUG=48857
TEST=none

Review URL: http://codereview.chromium.org/3173005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55789 0039d316-1c4b-4281-b951-d872f2087c98
void RenderView::DidInitiatePaint() {
  pepper_delegate_.ViewInitiatedPaint();

  for (std::set<WebPluginDelegatePepper*>::iterator i =
           current_oldstyle_pepper_plugins_.begin();
       i != current_oldstyle_pepper_plugins_.end(); ++i)
    (*i)->RenderViewInitiatedPaint();
}

void RenderView::DidInitiatePaint() {
  pepper_delegate_.ViewInitiatedPaint();

  for (std::set<WebPluginDelegatePepper*>::iterator i =
           current_oldstyle_pepper_plugins_.begin();
       i != current_oldstyle_pepper_plugins_.end(); ++i)
    (*i)->RenderViewInitiatedPaint();
}
