Add filtering of IPC messages when RenderFrameHost is swapped out.

BUG=351815

Review URL: https://codereview.chromium.org/205543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@258521 0039d316-1c4b-4281-b951-d872f2087c98
void RenderFrameHostImpl::ExecuteJavaScript(
    const base::string16& javascript) {
  Send(new FrameMsg_JavaScriptExecuteRequest(routing_id_,
                                             javascript,
                                             0, false));
}

void RenderFrameHostImpl::ExecuteJavaScript(
    const base::string16& javascript) {
  Send(new FrameMsg_JavaScriptExecuteRequest(routing_id_,
                                             javascript,
                                             0, false));
}
