Move most of the remaining users of WebContentsObserver::tab_contents() to use web_contents().

content/browser/intents/intent_injector.cc

Index: content/browser/intents/intent_injector.cc
===================================================================
--- content/browser/intents/intent_injector.cc	(revision 115777)
+++ content/browser/intents/intent_injector.cc	(working copy)
@@ -68,13 +68,13 @@
   if (source_intent_.get() == NULL ||
       !CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableWebIntents) ||
-      tab_contents()->GetRenderViewHost() == NULL) {
+      web_contents()->GetRenderViewHost() == NULL) {
     return;
   }
 
   // Send intent data through to renderer.
-  tab_contents()->GetRenderViewHost()->Send(new IntentsMsg_SetWebIntentData(
-      tab_contents()->GetRenderViewHost()->routing_id(),
+  web_contents()->GetRenderViewHost()->Send(new IntentsMsg_SetWebIntentData(
+      web_contents()->GetRenderViewHost()->routing_id(),
       *(source_intent_.get())));
   source_intent_.reset(NULL);
 }