remove some calls to to-be-deprecated v8::Value::To* functions

chrome/renderer/extensions/enterprise_platform_keys_natives.cc

 // Copyright 2014 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.
 
 #include "chrome/renderer/extensions/enterprise_platform_keys_natives.h"
 
 #include <string>
 
 #include "base/values.h"
 #include "chrome/renderer/extensions/chrome_v8_context.h"
@@ skipping 78 matching lines @@
 
   blink::WebCryptoOperation operation;
   if (!StringToWebCryptoOperation(*v8::String::Utf8Value(call_info[1]),
                                   &operation)) {
     return;
   }
 
   blink::WebString error_details;
   int exception_code = 0;
 
-  blink::WebCryptoAlgorithm algorithm =
-      blink::normalizeCryptoAlgorithm(call_info[0]->ToObject(),
-                                      operation,
-                                      &exception_code,
-                                      &error_details,
-                                      call_info.GetIsolate());
+  blink::WebCryptoAlgorithm algorithm = blink::normalizeCryptoAlgorithm(
+      v8::Local<v8::Object>::Cast(call_info[0]), operation, &exception_code,
+      &error_details, call_info.GetIsolate());
 
   scoped_ptr<base::DictionaryValue> algorithm_dict;
   if (!algorithm.isNull())
     algorithm_dict = WebCryptoAlgorithmToBaseValue(algorithm);
 
   if (!algorithm_dict)
     return;
 
   scoped_ptr<content::V8ValueConverter> converter(
       content::V8ValueConverter::create());
   call_info.GetReturnValue().Set(
       converter->ToV8Value(algorithm_dict.get(), context()->v8_context()));
 }
 
 }  // namespace extensions