Use ScopedTaskEnvironment instead of MessageLoop in tests that use v8.

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 "extensions/renderer/gc_callback.h"
+
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/features/feature.h"
-#include "extensions/renderer/gc_callback.h"
 #include "extensions/renderer/scoped_web_frame.h"
 #include "extensions/renderer/script_context.h"
 #include "extensions/renderer/script_context_set.h"
 #include "extensions/renderer/test_extensions_renderer_client.h"
 #include "gin/function_template.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "v8/include/v8.h"
 
 namespace extensions {
 namespace {
 
 void SetToTrue(bool* value) {
   if (*value)
     ADD_FAILURE() << "Value is already true";
   *value = true;
 }
 
 class GCCallbackTest : public testing::Test {
  public:
   GCCallbackTest() : script_context_set_(&active_extensions_) {}
 
  protected:
-  base::MessageLoop& message_loop() { return message_loop_; }
-
   ScriptContextSet& script_context_set() { return script_context_set_; }
 
   v8::Local<v8::Context> v8_context() {
     return v8::Local<v8::Context>::New(v8::Isolate::GetCurrent(), v8_context_);
   }
 
   ScriptContext* RegisterScriptContext() {
     // No world ID.
     return script_context_set_.Register(
         web_frame_.frame(),
@@ skipping 15 matching lines @@
         web_frame_.frame()->MainWorldScriptContext();
     DCHECK(!local_v8_context.IsEmpty());
     v8_context_.Reset(isolate, local_v8_context);
   }
 
   void TearDown() override {
     v8_context_.Reset();
     RequestGarbageCollection();
   }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
+
   ScopedWebFrame web_frame_;  // (this will construct the v8::Isolate)
   // ExtensionsRendererClient is a dependency of ScriptContextSet.
   TestExtensionsRendererClient extensions_renderer_client_;
   ExtensionIdSet active_extensions_;
   ScriptContextSet script_context_set_;
   v8::Global<v8::Context> v8_context_;
 
   DISALLOW_COPY_AND_ASSIGN(GCCallbackTest);
 };
 
@@ skipping 68 matching lines @@
   // Trigger a GC. The callback should not be invoked because the fallback was
   // already invoked.
   RequestGarbageCollection();
   base::RunLoop().RunUntilIdle();
 
   EXPECT_FALSE(callback_invoked);
 }
 
 }  // namespace
 }  // namespace extensions