Get rid of some lingering MD-specific raster assets.

chrome/browser/ui/extensions/extension_action_view_controller.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ACTION_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ACTION_VIEW_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
@@ skipping 68 matching lines @@
   // exists. Returns true if |command| was populated.
   bool GetExtensionCommand(extensions::Command* command);
 
   const extensions::Extension* extension() const { return extension_.get(); }
   Browser* browser() { return browser_; }
   ExtensionAction* extension_action() { return extension_action_; }
   const ExtensionAction* extension_action() const { return extension_action_; }
   ToolbarActionViewDelegate* view_delegate() { return view_delegate_; }
   bool is_showing_popup() const { return popup_host_ != nullptr; }
 
-  void set_icon_observer(ExtensionActionIconFactory::Observer* icon_observer) {
-    icon_observer_ = icon_observer;
-  }
-
   std::unique_ptr<IconWithBadgeImageSource> GetIconImageSourceForTesting(
       content::WebContents* web_contents,
       const gfx::Size& size);
 
  private:
   // ExtensionActionIconFactory::Observer:
   void OnIconUpdated() override;
 
   // ExtensionHostObserver:
   void OnExtensionHostDestroyed(const extensions::ExtensionHost* host) override;
@@ skipping 75 matching lines @@
 
   // The delegate to handle platform-specific implementations.
   std::unique_ptr<ExtensionActionPlatformDelegate> platform_delegate_;
 
   // The object that will be used to get the browser action icon for us.
   // It may load the icon asynchronously (in which case the initial icon
   // returned by the factory will be transparent), so we have to observe it for
   // updates to the icon.
   ExtensionActionIconFactory icon_factory_;
 
-  // An additional observer that we need to notify when the icon of the button
-  // has been updated.
-  ExtensionActionIconFactory::Observer* icon_observer_;
-
   // The associated ExtensionRegistry; cached for quick checking.
   extensions::ExtensionRegistry* extension_registry_;
 
   ScopedObserver<extensions::ExtensionHost, extensions::ExtensionHostObserver>
       popup_host_observer_;
 
   base::WeakPtrFactory<ExtensionActionViewController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionActionViewController);
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ACTION_VIEW_CONTROLLER_H_