Convert //extensions/renderer from scoped_ptr to std::unique_ptr

extensions/renderer/gc_callback_unittest.cc

 // Copyright 2015 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 "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
@@ skipping 58 matching lines @@
     gin_context_holder_.reset();
     v8_context_.Reset();
     RequestGarbageCollection();
   }
 
   base::MessageLoop message_loop_;
   ScopedWebFrame web_frame_;  // (this will construct the v8::Isolate)
   ExtensionIdSet active_extensions_;
   ScriptContextSet script_context_set_;
   v8::Global<v8::Context> v8_context_;
-  scoped_ptr<gin::ContextHolder> gin_context_holder_;
+  std::unique_ptr<gin::ContextHolder> gin_context_holder_;
 
   DISALLOW_COPY_AND_ASSIGN(GCCallbackTest);
 };
 
 TEST_F(GCCallbackTest, GCBeforeContextInvalidated) {
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::HandleScope handle_scope(isolate);
   v8::Context::Scope context_scope(v8_context());
 
   ScriptContext* script_context = RegisterScriptContext();
@@ skipping 62 matching lines @@
   // Trigger a GC. The callback should not be invoked because the fallback was
   // already invoked.
   RequestGarbageCollection();
   message_loop().RunUntilIdle();
 
   EXPECT_FALSE(callback_invoked);
 }
 
 }  // namespace
 }  // namespace extensions