Revert of Enable gallery watches on Mac

chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc

Index: chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
diff --git a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
index 136aeeacb4ede8f4d37e6cf53a18d94d4e561bb3..9350683dcc5999868714271fb80294151b7259ec 100644
--- a/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
+++ b/chrome/browser/extensions/api/media_galleries_private/media_galleries_private_api.cc
@@ -194,6 +194,7 @@
     return;
   }
 
+#if defined(OS_WIN) || defined(OS_LINUX)
   MediaGalleriesPrivateEventRouter* router =
       MediaGalleriesPrivateAPI::Get(GetProfile())->GetEventRouter();
   DCHECK(router);
@@ -209,6 +210,11 @@
       base::Bind(&MediaGalleriesPrivateAddGalleryWatchFunction::HandleResponse,
                  this,
                  gallery_pref_id));
+#else
+  // Recursive gallery watch operation is not currently supported on Mac:
+  // crbug.com/144491
+  HandleResponse(gallery_pref_id, false);
+#endif
 }
 
 void MediaGalleriesPrivateAddGalleryWatchFunction::HandleResponse(
@@ -244,6 +250,8 @@
   if (!render_view_host() || !render_view_host()->GetProcess())
     return false;
 
+  // Remove gallery watch operation is currently supported on Mac:
+  // crbug.com/144491
   scoped_ptr<RemoveGalleryWatch::Params> params(
       RemoveGalleryWatch::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
@@ -260,6 +268,7 @@
 
 void MediaGalleriesPrivateRemoveGalleryWatchFunction::OnPreferencesInit(
     const std::string& pref_id) {
+#if defined(OS_WIN) || defined(OS_LINUX)
   base::FilePath gallery_file_path;
   MediaGalleryPrefId gallery_pref_id = 0;
   if (!GetGalleryFilePathAndId(pref_id,
@@ -283,6 +292,7 @@
   GalleryWatchStateTracker* state_tracker = MediaGalleriesPrivateAPI::Get(
       GetProfile())->GetGalleryWatchStateTracker();
   state_tracker->OnGalleryWatchRemoved(extension_id(), gallery_pref_id);
+#endif
   SendResponse(true);
 }
 
@@ -310,6 +320,7 @@
 
 void MediaGalleriesPrivateGetAllGalleryWatchFunction::OnPreferencesInit() {
   std::vector<std::string> result;
+#if defined(OS_WIN) || defined(OS_LINUX)
   GalleryWatchStateTracker* state_tracker = MediaGalleriesPrivateAPI::Get(
       GetProfile())->GetGalleryWatchStateTracker();
   MediaGalleryPrefIdSet gallery_ids =
@@ -318,6 +329,7 @@
        iter != gallery_ids.end(); ++iter) {
     result.push_back(base::Uint64ToString(*iter));
   }
+#endif
   results_ = GetAllGalleryWatch::Results::Create(result);
   SendResponse(true);
 }
@@ -345,6 +357,7 @@
 }
 
 void MediaGalleriesPrivateRemoveAllGalleryWatchFunction::OnPreferencesInit() {
+#if defined(OS_WIN) || defined(OS_LINUX)
   MediaGalleriesPreferences* preferences =
       g_browser_process->media_file_system_registry()->GetPreferences(
           GetProfile());
@@ -352,6 +365,7 @@
       GetProfile())->GetGalleryWatchStateTracker();
   state_tracker->RemoveAllGalleryWatchersForExtension(
       extension_id(), preferences);
+#endif
   SendResponse(true);
 }