Update V8 to r5675 as required by WebKit r70209

Change-Id: Ib10adb470d41ca8c109ead5fc893b880e18d489f
diff --git a/include/v8-debug.h b/include/v8-debug.h
old mode 100644
new mode 100755
index 414fd86..4314727
--- a/include/v8-debug.h
+++ b/include/v8-debug.h
@@ -253,9 +253,12 @@
   static bool SetDebugEventListener(v8::Handle<v8::Object> that,
                                     Handle<Value> data = Handle<Value>());
 
-  // Break execution of JavaScript.
+  // Schedule a debugger break to happen when JavaScript code is run.
   static void DebugBreak();
 
+  // Remove scheduled debugger break if it has not happened yet.
+  static void CancelDebugBreak();
+
   // Break execution of JavaScript (this method can be invoked from a
   // non-VM thread) for further client command execution on a VM
   // thread. Client data is then passed in EventDetails to