Create thread-safe RendererExtensionRegistry from ExtensionSet

extensions/renderer/script_context_set_unittest.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 <vector>
 
 #include "base/message_loop/message_loop.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/features/feature.h"
@@ skipping 15 matching lines @@
   // Isolate.
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
 
   v8::HandleScope handle_scope(isolate);
   v8::Local<v8::Context> v8_context = v8::Context::New(isolate);
   v8::Context::Scope context_scope(v8_context);
   // ScriptContext relies on gin, it just doesn't look like it from here.
   gin::ContextHolder context_holder(isolate);
   context_holder.SetContext(v8_context);
 
-  ExtensionSet extensions;
   ExtensionIdSet active_extensions;
-  ScriptContextSet context_set(&extensions, &active_extensions);
+  ScriptContextSet context_set(&active_extensions);
   ScriptContext* context = context_set.Register(
       web_frame.frame(), v8_context, 0, 0);  // no extension group or world ID
 
   // Context is valid and resembles correctness.
   EXPECT_TRUE(context->is_valid());
   EXPECT_EQ(web_frame.frame(), context->web_frame());
   EXPECT_EQ(v8_context, context->v8_context());
 
   // Context has been correctly added.
   EXPECT_EQ(1u, context_set.size());
   EXPECT_EQ(context, context_set.GetByV8Context(v8_context));
 
   // Test context is correctly removed.
   context_set.Remove(context);
   EXPECT_EQ(0u, context_set.size());
   EXPECT_EQ(nullptr, context_set.GetByV8Context(v8_context));
 
   // After removal, the context should be marked for destruction.
   EXPECT_FALSE(context->is_valid());
 
   // Run loop to do the actual deletion.
   loop.RunUntilIdle();
 }
 
 }  // namespace extensions