gin: Use V8 Maybe APIs

gin/try_catch.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GIN_TRY_CATCH_H_
 #define GIN_TRY_CATCH_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "gin/gin_export.h"
 #include "v8/include/v8.h"
 
 namespace gin {
 
 // TryCatch is a convenient wrapper around v8::TryCatch.
 class GIN_EXPORT TryCatch {
  public:
-  TryCatch();
+  explicit TryCatch(v8::Isolate* isolate);
   ~TryCatch();
 
   bool HasCaught();
   std::string GetStackTrace();
 
  private:
+  v8::Isolate* isolate_;
   v8::TryCatch try_catch_;
 
   DISALLOW_COPY_AND_ASSIGN(TryCatch);
 };
 
 }  // namespace gin
 
 #endif  // GIN_TRY_CATCH_H_