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

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 4e9428fea59e4dcb3ce2141103c97ed2112d7443..0b299f3ba6c03a1b506a5de18f1855c35c03d9dd 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1773,22 +1773,15 @@ void Browser::NotifyTabOfFullscreenExitIfNecessary() {
 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;
-  }
-  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 {
-    window_->ExitPresentationMode();
+    tab_fullscreen_accepted_ = entering_fullscreen &&
+        GetFullscreenSetting(url) == CONTENT_SETTING_ALLOW;
   }
+  if (entering_fullscreen)
+    window_->EnterPresentationMode(url, GetFullscreenExitBubbleType());
+  else
+    window_->ExitPresentationMode();
   WindowFullscreenStateChanged();
 }
 #endif