Revert of [blink] Unique pointers in Platform.h

content/shell/renderer/layout_test/layout_test_content_renderer_client.h

Index: content/shell/renderer/layout_test/layout_test_content_renderer_client.h
diff --git a/content/shell/renderer/layout_test/layout_test_content_renderer_client.h b/content/shell/renderer/layout_test/layout_test_content_renderer_client.h
index 4105c18e88a3d4668a878fa556eef1fa9f1755e3..7497fc9e684191cef4a5072b8ba7dd49359bd126 100644
--- a/content/shell/renderer/layout_test/layout_test_content_renderer_client.h
+++ b/content/shell/renderer/layout_test/layout_test_content_renderer_client.h
@@ -23,15 +23,13 @@
   void RenderThreadStarted() override;
   void RenderFrameCreated(RenderFrame* render_frame) override;
   void RenderViewCreated(RenderView* render_view) override;
-  std::unique_ptr<blink::WebMediaStreamCenter>
-  OverrideCreateWebMediaStreamCenter(
+  blink::WebMediaStreamCenter* OverrideCreateWebMediaStreamCenter(
       blink::WebMediaStreamCenterClient* client) override;
-  std::unique_ptr<blink::WebRTCPeerConnectionHandler>
-  OverrideCreateWebRTCPeerConnectionHandler(
+  blink::WebRTCPeerConnectionHandler* OverrideCreateWebRTCPeerConnectionHandler(
       blink::WebRTCPeerConnectionHandlerClient* client) override;
-  std::unique_ptr<blink::WebMIDIAccessor> OverrideCreateMIDIAccessor(
+  blink::WebMIDIAccessor* OverrideCreateMIDIAccessor(
       blink::WebMIDIAccessorClient* client) override;
-  std::unique_ptr<blink::WebAudioDevice> OverrideCreateAudioDevice(
+  blink::WebAudioDevice* OverrideCreateAudioDevice(
       const blink::WebAudioLatencyHint& latency_hint) override;
   blink::WebClipboard* OverrideWebClipboard() override;
   blink::WebThemeEngine* OverrideThemeEngine() override;