Media Galleries: Check for invalid files before passing them to the utility process.

BUG=399030

Review URL: https://codereview.chromium.org/441133003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287712 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc

@@ -56,6 +56,10 @@ void SafeAudioVideoChecker::OnProcessStarted() {
   IPC::PlatformFileForTransit file_for_transit =
       IPC::TakeFileHandleForProcess(file_.Pass(),
                                     utility_process_host_->GetData().handle);
+  if (file_for_transit == IPC::InvalidPlatformFileForTransit()) {
+    OnCheckingFinished(false /* valid? */);
+    return;
+  }
   const int64 kFileDecodeTimeInMS = 250;
   utility_process_host_->Send(new ChromeUtilityMsg_CheckMediaFile(
       kFileDecodeTimeInMS, file_for_transit));