[Mac] Fix a crash on calling ppapi mouse lock when fullscreen has permission

chrome/browser/ui/browser.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // OS_WIN
@@ skipping 1755 matching lines @@
   tab_fullscreen_accepted_ = false;
   mouse_lock_state_ = MOUSELOCK_NOT_REQUESTED;
 
   UpdateFullscreenExitBubbleContent();
 }
 
 #if defined(OS_MACOSX)
 void Browser::TogglePresentationMode(bool for_tab) {
   bool entering_fullscreen = !window_->InPresentationMode();
   GURL url;
-  bool ask_permission = false;
   if (for_tab) {
     url = GetSelectedTabContents()->GetURL();
-    ask_permission = GetFullscreenSetting(url) != CONTENT_SETTING_ALLOW;
+    tab_fullscreen_accepted_ = entering_fullscreen &&
+        GetFullscreenSetting(url) == CONTENT_SETTING_ALLOW;
   }
-  if (entering_fullscreen) {
-    FullscreenExitBubbleType type =
-        FEB_TYPE_BROWSER_FULLSCREEN_EXIT_INSTRUCTION;
-    if (for_tab) {
-      type = ask_permission ? FEB_TYPE_FULLSCREEN_BUTTONS :
-                              FEB_TYPE_FULLSCREEN_EXIT_INSTRUCTION;
-    }
-    window_->EnterPresentationMode(url, type);
-  } else {
+  if (entering_fullscreen)
+    window_->EnterPresentationMode(url, GetFullscreenExitBubbleType());
+  else
     window_->ExitPresentationMode();
-  }
   WindowFullscreenStateChanged();
 }
 #endif
 
 #if defined(OS_CHROMEOS)
 void Browser::Search() {
   // Exit fullscreen to show omnibox.
   if (window_->IsFullscreen()) {
     ToggleFullscreenMode(false);
     // ToggleFullscreenMode is asynchronous, so we don't have omnibox
@@ skipping 3699 matching lines @@
 }
 
 void Browser::UpdateFullscreenExitBubbleContent() {
   GURL url;
   if (fullscreened_tab_)
     url = fullscreened_tab_->tab_contents()->GetURL();
 
   window_->UpdateFullscreenExitBubbleContent(
       url, GetFullscreenExitBubbleType());
 }