Refactor away the Browser* dependency in exclusive_access

chrome/browser/ui/cocoa/browser_window_cocoa.h

Index: chrome/browser/ui/cocoa/browser_window_cocoa.h
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.h b/chrome/browser/ui/cocoa/browser_window_cocoa.h
index 018d88c4c16d2bc0f9341dd255fe24e9ae5bead0..a1ae062e7220a179f1992b3d54354cab5dbdbc66 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.h
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.h
@@ -10,6 +10,7 @@
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 #include "chrome/browser/signin/signin_header_helper.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 "components/bookmarks/browser/bookmark_model.h"
 #include "ui/base/ui_base_types.h"
@@ -31,10 +32,11 @@ class Extension;
 // the Cocoa NSWindow. Cross-platform code will interact with this object when
 // it needs to manipulate the window.
 
-class BrowserWindowCocoa :
-    public BrowserWindow,
-    public extensions::ExtensionKeybindingRegistry::Delegate,
-    public SearchModelObserver {
+class BrowserWindowCocoa
+    : public BrowserWindow,
+      public ExclusiveAccessContext,
+      public extensions::ExtensionKeybindingRegistry::Delegate,
+      public SearchModelObserver {
  public:
   BrowserWindowCocoa(Browser* browser,
                      BrowserWindowController* controller);
@@ -78,7 +80,7 @@ class BrowserWindowCocoa :
                        ExclusiveAccessBubbleType type,
                        bool with_toolbar) override;
   void ExitFullscreen() override;
-  void UpdateFullscreenExitBubbleContent(
+  void UpdateExclusiveAccessExitBubbleContent(
       const GURL& url,
       ExclusiveAccessBubbleType bubble_type) override;
   bool ShouldHideUIForFullscreen() const override;
@@ -157,6 +159,13 @@ class BrowserWindowCocoa :
   int GetRenderViewHeightInsetWithDetachedBookmarkBar() override;
   void ExecuteExtensionCommand(const extensions::Extension* extension,
                                const extensions::Command& command) override;
+  ExclusiveAccessContext* GetExclusiveAccessContext() override;
+
+  // ExclusiveAccessContext interface
+  Profile* GetProfile() override;
+  content::WebContents* GetActiveWebContents() override;
+  void UnhideDownloadShelf() override;
+  void HideDownloadShelf() override;
 
   // Overridden from ExtensionKeybindingRegistry::Delegate:
   extensions::ActiveTabPermissionGranter* GetActiveTabPermissionGranter()