[blink] Unique pointers in Platform.h

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index e561f09f70605dc8a067a5d5e3036656800cc280..5ab7ba898b73e0c2f34834c02d422172ec491436 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -1268,10 +1268,10 @@ bool ChromeContentRendererClient::IsExtensionOrSharedModuleWhitelisted(
 }
 #endif
 
-blink::WebSpeechSynthesizer*
+std::unique_ptr<blink::WebSpeechSynthesizer>
 ChromeContentRendererClient::OverrideSpeechSynthesizer(
     blink::WebSpeechSynthesizerClient* client) {
-  return new TtsDispatcher(client);
+  return base::MakeUnique<TtsDispatcher>(client);
 }
 
 bool ChromeContentRendererClient::AllowPepperMediaStreamAPI(