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::OnPaste() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Paste"));
  UserMetricsRecordAction("Paste");
}

void RenderView::OnPaste() {
  if (!webview())
    return;

  webview()->focusedFrame()->executeCommand(WebString::fromUTF8("Paste"));
  UserMetricsRecordAction("Paste");
}
