Make AppListServiceAsh::OnProfileWillBeRemoved do nothing.

This CL stops AppListServiceAsh handling an event it shouldn't care about,
preventing the AppListServiceViews on Linux handling it correctly.

BUG=469032

Review URL: https://codereview.chromium.org/1020133002

Cr-Commit-Position: refs/heads/master@{#322322}

chrome/browser/ui/ash/app_list/app_list_service_ash.cc

@@ -61,6 +61,10 @@ void AppListServiceAsh::Init(Profile* initial_profile) {
     service->Init();
 }
 
+void AppListServiceAsh::OnProfileWillBeRemoved(
+    const base::FilePath& profile_path) {
+}
+
 base::FilePath AppListServiceAsh::GetProfilePath(
     const base::FilePath& user_data_dir) {
   return ChromeLauncherController::instance()->profile()->GetPath();

chrome/browser/ui/ash/app_list/app_list_service_ash.h

@@ -21,6 +21,12 @@ class AppListServiceAsh : public AppListServiceImpl {
   // AppListService overrides:
   void Init(Profile* initial_profile) override;
 
+  // ProfileInfoCacheObserver overrides:
+  // On ChromeOS this should never happen. On other platforms, there is always a
+  // Non-ash AppListService that is responsible for handling this.
+  // TODO(calamity): Ash shouldn't observe the ProfileInfoCache at all.
+  void OnProfileWillBeRemoved(const base::FilePath& profile_path) override;
+
  private:
   friend struct DefaultSingletonTraits<AppListServiceAsh>;