navigator.vibrate() crash avoidance when in a detached state.

Source/modules/vibration/NavigatorVibration.cpp

Index: Source/modules/vibration/NavigatorVibration.cpp
diff --git a/Source/modules/vibration/NavigatorVibration.cpp b/Source/modules/vibration/NavigatorVibration.cpp
index c4a16ffbd122ea0065c500d8efac0e779dbe0cd3..ed0d441c28787d3974167cd670b88a4b0fc5062b 100644
--- a/Source/modules/vibration/NavigatorVibration.cpp
+++ b/Source/modules/vibration/NavigatorVibration.cpp
@@ -145,7 +145,7 @@ bool NavigatorVibration::vibrate(Navigator& navigator, unsigned time)
 
 bool NavigatorVibration::vibrate(Navigator& navigator, const VibrationPattern& pattern)
 {
-    Page* page = navigator.frame()->page();
+    Page* page = navigator.frame() ? navigator.frame()->page() : 0;

[haraken, 2014/05/20 10:56:48]

Or you can write:

if (!navigator.frame())
  return false;

[sof, 2014/05/20 12:42:46]

Done.

     if (!page)
         return false;