[Content] Update V8ValueConverter::create to return a std::unique_ptr

extensions/renderer/api_signature.cc

 // Copyright 2016 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 "extensions/renderer/api_signature.h"
 
 #include <algorithm>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
@@ skipping 309 matching lines @@
     v8::Local<v8::Value> value = arguments.back();
     --size;
     // Bindings should ensure that the value here is appropriate, but see the
     // comment above for limitations.
     DCHECK(value->IsFunction() || value->IsUndefined() || value->IsNull());
     if (value->IsFunction())
       callback = value.As<v8::Function>();
   }
 
   auto json = base::MakeUnique<base::ListValue>();
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
+  std::unique_ptr<content::V8ValueConverter> converter =
+      content::V8ValueConverter::Create();
   converter->SetFunctionAllowed(true);
   for (size_t i = 0; i < size; ++i) {
     std::unique_ptr<base::Value> converted =
         converter->FromV8Value(arguments[i], context);
     if (!converted)
       return false;
     json->Append(std::move(converted));
   }
 
   *json_out = std::move(json);
@@ skipping 12 matching lines @@
     pieces.push_back(
         base::StringPrintf("%s%s %s", spec->optional() ? kOptionalPrefix : "",
                            spec->GetTypeName().c_str(), spec->name().c_str()));
   }
   expected_signature_ = base::JoinString(pieces, ", ");
 
   return expected_signature_;
 }
 
 }  // namespace extensions