Revert 152017 - Add chrome.runtime.onStartup, which is fired on browser start.

chrome/browser/extensions/api/runtime/runtime_api.h

Index: chrome/browser/extensions/api/runtime/runtime_api.h
===================================================================
--- chrome/browser/extensions/api/runtime/runtime_api.h	(revision 152126)
+++ chrome/browser/extensions/api/runtime/runtime_api.h	(working copy)
@@ -15,10 +15,6 @@
 
 class RuntimeEventRouter {
  public:
-  // Dispatches the onStartup event to all currently-loaded extensions.
-  static void DispatchOnStartupEvent(Profile* profile,
-                                     const std::string& extension_id);
-
   // Dispatches the onInstalled event to the given extension.
   static void DispatchOnInstalledEvent(Profile* profile,
                                        const std::string& extension_id);