Dispatch geolocation IPCs on the UI thread. Aside from simplifying the code to avoid a lot of threa…

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
===================================================================
--- android_webview/native/aw_contents.cc	(revision 269778)
+++ android_webview/native/aw_contents.cc	(working copy)
@@ -135,12 +135,12 @@
 
 // static
 AwContents* AwContents::FromWebContents(WebContents* web_contents) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return AwContentsUserData::GetContents(web_contents);
 }
 
 // static
 AwContents* AwContents::FromID(int render_process_id, int render_view_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   const content::RenderViewHost* rvh =
       content::RenderViewHost::FromID(render_process_id, render_view_id);
   if (!rvh) return NULL;