Revert of [blink] Unique pointers in Platform.h

content/shell/renderer/layout_test/layout_test_content_renderer_client.cc

Index: content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
diff --git a/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc b/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
index 5c0be1c2c1d6ef8270d61062a24c1dcd7cd1a308..8562261948d5688c3a1054d852f5bb2e5db993e2 100644
--- a/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
+++ b/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
@@ -34,8 +34,6 @@
 #include "media/media_features.h"
 #include "third_party/WebKit/public/platform/WebAudioLatencyHint.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamCenter.h"
-#include "third_party/WebKit/public/platform/WebRTCPeerConnectionHandler.h"
-#include "third_party/WebKit/public/platform/modules/webmidi/WebMIDIAccessor.h"
 #include "third_party/WebKit/public/web/WebFrameWidget.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebPluginParams.h"
@@ -165,7 +163,7 @@
       ->InitializeWebViewWithMocks(render_view->GetWebView());
 }
 
-std::unique_ptr<WebMediaStreamCenter>
+WebMediaStreamCenter*
 LayoutTestContentRendererClient::OverrideCreateWebMediaStreamCenter(
     WebMediaStreamCenterClient* client) {
 #if BUILDFLAG(ENABLE_WEBRTC)
@@ -173,11 +171,11 @@
       LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
   return interfaces->CreateMediaStreamCenter(client);
 #else
-  return nullptr;
-#endif
-}
-
-std::unique_ptr<WebRTCPeerConnectionHandler>
+  return NULL;
+#endif
+}
+
+WebRTCPeerConnectionHandler*
 LayoutTestContentRendererClient::OverrideCreateWebRTCPeerConnectionHandler(
     WebRTCPeerConnectionHandlerClient* client) {
 #if BUILDFLAG(ENABLE_WEBRTC)
@@ -185,11 +183,11 @@
       LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
   return interfaces->CreateWebRTCPeerConnectionHandler(client);
 #else
-  return nullptr;
-#endif
-}
-
-std::unique_ptr<WebMIDIAccessor>
+  return NULL;
+#endif
+}
+
+WebMIDIAccessor*
 LayoutTestContentRendererClient::OverrideCreateMIDIAccessor(
     WebMIDIAccessorClient* client) {
   test_runner::WebTestInterfaces* interfaces =
@@ -197,8 +195,7 @@
   return interfaces->CreateMIDIAccessor(client);
 }
 
-std::unique_ptr<WebAudioDevice>
-LayoutTestContentRendererClient::OverrideCreateAudioDevice(
+WebAudioDevice* LayoutTestContentRendererClient::OverrideCreateAudioDevice(
     const blink::WebAudioLatencyHint& latency_hint) {
   const double hw_buffer_size = 128;
   const double hw_sample_rate = 44100;