Removed emojis from generated_resources.grd and update the code.

chrome/browser/ui/cocoa/browser_window_cocoa.h

 // Copyright (c) 2012 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_COCOA_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 #include "chrome/browser/signin/chrome_signin_helper.h"
 #include "chrome/browser/ssl/security_state_model.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/exclusive_access/exclusive_access_context.h"
 #include "chrome/browser/ui/search/search_model_observer.h"
+#include "chrome/browser/ui/tabs/tab_utils.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "ui/base/ui_base_types.h"
 
 class Browser;
 @class BrowserWindowController;
 @class FindBarCocoaController;
 @class NSEvent;
 @class NSMenu;
 @class NSWindow;
 
@@ skipping 144 matching lines @@
   extensions::ActiveTabPermissionGranter* GetActiveTabPermissionGranter()
       override;
 
   // Overridden from SearchModelObserver:
   void ModelChanged(const SearchModel::State& old_state,
                     const SearchModel::State& new_state) override;
 
   // Adds the given FindBar cocoa controller to this browser window.
   void AddFindBar(FindBarCocoaController* find_bar_cocoa_controller);
 
+  // Update window media state to show if one of the tabs within the window is
+  // playing an audio/video or even if it's playing something but it's muted.
+  void UpdateMediaState(TabMediaState media_state);
+
   // Returns the cocoa-world BrowserWindowController
   BrowserWindowController* cocoa_controller() { return controller_; }
 
+  // Returns window title based on the active tab title and window media state.
+  NSString* WindowTitle();
+
+  // Returns current media state, determined by the media state of tabs, set by
+  // UpdateMediaState.
+  TabMediaState media_state() { return media_state_; }
+
  protected:
   void DestroyBrowser() override;
 
  private:
   NSWindow* window() const;  // Accessor for the (current) |NSWindow|.
 
   Browser* browser_;  // weak, owned by controller
   BrowserWindowController* controller_;  // weak, owns us
   base::scoped_nsobject<NSString> pending_window_title_;
   ui::WindowShowState initial_show_state_;
   NSInteger attention_request_id_;  // identifier from requestUserAttention
+
+  // Preserves window media state to show appropriate icon in the window title
+  // which can be audio playing, muting or none (determined by media state of
+  // tabs.
+  TabMediaState media_state_;
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_COCOA_H_