Move global V8::IsDead() into the Isolate.

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index aee4890aa066a9a949346d522b3106174fba9ae3..3258f2a66875cfb68f3f8d891bdf34e028a282c7 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -83,10 +83,6 @@ class V8 : public AllStatic {
   static bool Initialize(Deserializer* des);
   static void TearDown();
   static bool IsRunning() { return is_running_; }
-  // To be dead you have to have lived
-  // TODO(isolates): move IsDead to Isolate.
-  static bool IsDead() { return has_fatal_error_ || has_been_disposed_; }
-  static void SetFatalError();
 
   // Report process out of memory. Implementation found in api.cc.
   static void FatalProcessOutOfMemory(const char* location,
@@ -134,9 +130,6 @@ class V8 : public AllStatic {
   static bool is_running_;
   // True if V8 has ever been run
   static bool has_been_set_up_;
-  // True if error has been signaled for current engine
-  // (reset to false if engine is restarted)
-  static bool has_fatal_error_;
   // True if engine has been shut down
   // (reset if engine is restarted)
   static bool has_been_disposed_;