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::OnAutoFillFormDataFilled(int query_id,
                                          const webkit_glue::FormData& form) {
  autofill_helper_.FormDataFilled(query_id, form);
}

void RenderView::OnAutoFillFormDataFilled(int query_id,
                                          const webkit_glue::FormData& form) {
  autofill_helper_.FormDataFilled(query_id, form);
}
