Replaced empty handle checks with MaybeHandles

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 117 matching lines @@
 // TODO(yangguo): Remove after we completely changed to MaybeHandles.
 #define RETURN_IF_EMPTY_HANDLE_VALUE(isolate, call, value)  \
   do {                                                      \
     if ((call).is_null()) {                                 \
       ASSERT((isolate)->has_pending_exception());           \
       return (value);                                       \
     }                                                       \
   } while (false)
 
 // TODO(yangguo): Remove after we completely changed to MaybeHandles.
-#define CHECK_NOT_EMPTY_HANDLE(isolate, call)     \
-  do {                                            \
-    ASSERT(!(isolate)->has_pending_exception());  \
-    CHECK(!(call).is_null());                     \
-  } while (false)
-
-// TODO(yangguo): Remove after we completely changed to MaybeHandles.
 #define RETURN_IF_EMPTY_HANDLE(isolate, call)  \
   RETURN_IF_EMPTY_HANDLE_VALUE(isolate, call, Failure::Exception())
 
 
 // Macros for MaybeHandle.
 
 #define RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, T)  \
   do {                                                       \
     Isolate* __isolate__ = (isolate);                        \
     if (__isolate__->has_scheduled_exception()) {            \
@@ skipping 1389 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_