Clean up NOTIFICATION_EXTENSION_PAGE_ACTION_[ COUNT | VISIBILITY ]_CHANGED

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index 9665cf15d2dc9a0787624d816f4c20b669607301..effbc7394ae0fa09cdcfa5137857295945510ef1 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -145,7 +145,7 @@ LocationBarViewMac::LocationBarViewMac(AutocompleteTextField* field,
 
   registrar_.Add(
       this,
-      extensions::NOTIFICATION_EXTENSION_PAGE_ACTION_VISIBILITY_CHANGED,
+      extensions::NOTIFICATION_EXTENSION_PAGE_ACTIONS_UPDATED,
       content::NotificationService::AllSources());
   content::Source<Profile> profile_source = content::Source<Profile>(profile);
   registrar_.Add(this,
@@ -225,27 +225,13 @@ void LocationBarViewMac::UpdateManagePasswordsIconAndBubble() {
 }
 
 void LocationBarViewMac::UpdatePageActions() {
-  size_t count_before = page_action_decorations_.size();
   RefreshPageActionDecorations();
   Layout();
-  if (page_action_decorations_.size() != count_before) {
-    content::NotificationService::current()->Notify(
-        extensions::NOTIFICATION_EXTENSION_PAGE_ACTION_COUNT_CHANGED,
-        content::Source<LocationBar>(this),
-        content::NotificationService::NoDetails());
-  }
 }
 
 void LocationBarViewMac::InvalidatePageActions() {
-  size_t count_before = page_action_decorations_.size();
   DeletePageActionDecorations();
   Layout();
-  if (page_action_decorations_.size() != count_before) {
-    content::NotificationService::current()->Notify(
-        extensions::NOTIFICATION_EXTENSION_PAGE_ACTION_COUNT_CHANGED,
-        content::Source<LocationBar>(this),
-        content::NotificationService::NoDetails());
-  }
 }
 
 void LocationBarViewMac::UpdateOpenPDFInReaderPrompt() {
@@ -635,9 +621,8 @@ void LocationBarViewMac::Observe(int type,
                                  const content::NotificationSource& source,
                                  const content::NotificationDetails& details) {
   switch (type) {
-    case extensions::NOTIFICATION_EXTENSION_PAGE_ACTION_VISIBILITY_CHANGED: {
-      WebContents* contents = GetWebContents();
-      if (content::Details<WebContents>(contents) != details)
+    case extensions::NOTIFICATION_EXTENSION_PAGE_ACTIONS_UPDATED: {
+      if (content::Source<WebContents>(source).ptr() != GetWebContents())
         return;
 
       [field_ updateMouseTracking];