Move ExtensionEventRouter and related into extensions namespace

Moved ExtensionEventRouter, ExtensionEventRouterForwarder,
ExtensionBrowserEventRouter into extensions namespace and renamed them
appropriately. Also some header file gardening.

BUG=137115, 117261


Review URL: https://chromiumcodereview.appspot.com/10696208

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147984 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/permissions_updater.cc b/chrome/browser/extensions/permissions_updater.cc
index 9741d9b..e56fbba 100644
--- a/chrome/browser/extensions/permissions_updater.cc
+++ b/chrome/browser/extensions/permissions_updater.cc
@@ -8,7 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/permissions/permissions_api_helpers.h"
-#include "chrome/browser/extensions/extension_event_router.h"
+#include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"