Remove ui::WorkAreaWatcherObserver from AppController.

This was originally added in 33190c88
for the panels feature, which was then later removed in
566d3644. Currently nothing adds an
observer for this notification.

Bug: 571511
Change-Id: I1ecbcacffd1451d70912895c106858eb616e6a80
Reviewed-on: https://chromium-review.googlesource.com/743857Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512546}

chrome/browser/app_controller_mac.h

@@ -14,10 +14,8 @@
 
 #include "base/files/file_path.h"
 #include "base/mac/scoped_nsobject.h"
-#include "base/observer_list.h"
 #include "base/time/time.h"
 #include "components/prefs/pref_change_registrar.h"
-#include "ui/base/work_area_watcher_observer.h"
 
 class AppControllerProfileObserver;
 @class AppShimMenuController;
@@ -33,10 +31,6 @@ class QuitWithAppsController;
 class ScopedKeepAlive;
 @class ShareMenuController;
 
-namespace ui {
-class WorkAreaWatcherObserver;
-}
-
 // The application controller object, created by loading the MainMenu nib.
 // This handles things like responding to menus when there are no windows
 // open, etc and acts as the NSApplication delegate.
@@ -97,9 +91,6 @@ class WorkAreaWatcherObserver;
   // event, the time we got the event. A null time otherwise.
   base::TimeTicks reopenTime_;
 
-  // Observers that listen to the work area changes.
-  base::ObserverList<ui::WorkAreaWatcherObserver> workAreaChangeObservers_;
-
   std::unique_ptr<PrefChangeRegistrar> profilePrefRegistrar_;
   PrefChangeRegistrar localPrefRegistrar_;
 
@@ -168,10 +159,6 @@ class WorkAreaWatcherObserver;
 - (BookmarkMenuBridge*)bookmarkMenuBridge;
 - (HistoryMenuBridge*)historyMenuBridge;
 
-// Subscribes/unsubscribes from the work area change notification.
-- (void)addObserverForWorkAreaChange:(ui::WorkAreaWatcherObserver*)observer;
-- (void)removeObserverForWorkAreaChange:(ui::WorkAreaWatcherObserver*)observer;
-
 // Initializes the AppShimMenuController. This enables changing the menu bar for
 // apps.
 - (void)initAppShimMenuController;

chrome/browser/app_controller_mac.mm

@@ -1535,14 +1535,6 @@ static base::mac::ScopedObjCClassSwizzler* g_swizzle_imk_input_session;
   return historyMenuBridge_.get();
 }
 
-- (void)addObserverForWorkAreaChange:(ui::WorkAreaWatcherObserver*)observer {
-  workAreaChangeObservers_.AddObserver(observer);
-}
-
-- (void)removeObserverForWorkAreaChange:(ui::WorkAreaWatcherObserver*)observer {
-  workAreaChangeObservers_.RemoveObserver(observer);
-}
-
 - (void)initAppShimMenuController {
   if (!appShimMenuController_)
     appShimMenuController_.reset([[AppShimMenuController alloc] init]);
@@ -1599,18 +1591,6 @@ static base::mac::ScopedObjCClassSwizzler* g_swizzle_imk_input_session;
                  lastProfile_));
 }
 
-- (void)applicationDidChangeScreenParameters:(NSNotification*)notification {
-  // During this callback the working area is not always already updated. Defer.
-  [self performSelector:@selector(delayedScreenParametersUpdate)
-             withObject:nil
-             afterDelay:0];
-}
-
-- (void)delayedScreenParametersUpdate {
-  for (auto& observer : workAreaChangeObservers_)
-    observer.WorkAreaChanged();
-}
-
 - (BOOL)application:(NSApplication*)application
     willContinueUserActivityWithType:(NSString*)userActivityType
     API_AVAILABLE(macos(10.10)) {