[Extensions] Make Event::restrict_to_browser_context const.

chrome/browser/speech/extension_api/tts_engine_extension_api.cc

 // Copyright (c) 2012 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/browser/speech/extension_api/tts_engine_extension_api.h"
 
 #include <stddef.h>
 #include <string>
 #include <utility>
 
@@ skipping 177 matching lines @@
     options->SetString(constants::kVoiceNameKey, voice.name);
   if (!options->HasKey(constants::kLangKey))
     options->SetString(constants::kLangKey, voice.lang);
 
   args->Append(std::move(options));
   args->AppendInteger(utterance->id());
 
   std::string json;
   base::JSONWriter::Write(*args, &json);
 
-  std::unique_ptr<extensions::Event> event(
-      new extensions::Event(extensions::events::TTS_ENGINE_ON_SPEAK,
-                            tts_engine_events::kOnSpeak, std::move(args)));
   Profile* profile = Profile::FromBrowserContext(utterance->browser_context());
-  event->restrict_to_browser_context = profile;
+  auto event = base::MakeUnique<extensions::Event>(
+      extensions::events::TTS_ENGINE_ON_SPEAK, tts_engine_events::kOnSpeak,
+      std::move(args), profile);
   EventRouter::Get(profile)
       ->DispatchEventToExtension(utterance->extension_id(), std::move(event));
 }
 
 void TtsExtensionEngine::Stop(Utterance* utterance) {
   std::unique_ptr<base::ListValue> args(new base::ListValue());
-  std::unique_ptr<extensions::Event> event(
-      new extensions::Event(extensions::events::TTS_ENGINE_ON_STOP,
-                            tts_engine_events::kOnStop, std::move(args)));
   Profile* profile = Profile::FromBrowserContext(utterance->browser_context());
-  event->restrict_to_browser_context = profile;
+  auto event = base::MakeUnique<extensions::Event>(
+      extensions::events::TTS_ENGINE_ON_STOP, tts_engine_events::kOnStop,
+      std::move(args), profile);
   EventRouter::Get(profile)
       ->DispatchEventToExtension(utterance->extension_id(), std::move(event));
 }
 
 void TtsExtensionEngine::Pause(Utterance* utterance) {
   std::unique_ptr<base::ListValue> args(new base::ListValue());
-  std::unique_ptr<extensions::Event> event(
-      new extensions::Event(extensions::events::TTS_ENGINE_ON_PAUSE,
-                            tts_engine_events::kOnPause, std::move(args)));
   Profile* profile = Profile::FromBrowserContext(utterance->browser_context());
-  event->restrict_to_browser_context = profile;
+  auto event = base::MakeUnique<extensions::Event>(
+      extensions::events::TTS_ENGINE_ON_PAUSE, tts_engine_events::kOnPause,
+      std::move(args), profile);
   EventRouter* event_router = EventRouter::Get(profile);
   std::string id = utterance->extension_id();
   event_router->DispatchEventToExtension(id, std::move(event));
   WarnIfMissingPauseOrResumeListener(profile, event_router, id);
 }
 
 void TtsExtensionEngine::Resume(Utterance* utterance) {
   std::unique_ptr<base::ListValue> args(new base::ListValue());
-  std::unique_ptr<extensions::Event> event(
-      new extensions::Event(extensions::events::TTS_ENGINE_ON_RESUME,
-                            tts_engine_events::kOnResume, std::move(args)));
   Profile* profile = Profile::FromBrowserContext(utterance->browser_context());
-  event->restrict_to_browser_context = profile;
+  auto event = base::MakeUnique<extensions::Event>(
+      extensions::events::TTS_ENGINE_ON_RESUME, tts_engine_events::kOnResume,
+      std::move(args), profile);
   EventRouter* event_router = EventRouter::Get(profile);
   std::string id = utterance->extension_id();
   event_router->DispatchEventToExtension(id, std::move(event));
   WarnIfMissingPauseOrResumeListener(profile, event_router, id);
 }
 
 bool TtsExtensionEngine::LoadBuiltInTtsExtension(
     content::BrowserContext* browser_context) {
 #if defined(OS_CHROMEOS)
   Profile* profile = Profile::FromBrowserContext(browser_context);
@@ skipping 76 matching lines @@
         utterance_id, TTS_EVENT_PAUSE, char_index, std::string());
   } else if (event_type == constants::kEventTypeResume) {
     controller->OnTtsEvent(
         utterance_id, TTS_EVENT_RESUME, char_index, std::string());
   } else {
     EXTENSION_FUNCTION_VALIDATE(false);
   }
 
   return RespondNow(NoArguments());
 }