Revert of [blink] Unique pointers in Platform.h

content/test/test_blink_web_unit_test_support.cc

 // Copyright 2013 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 "content/test/test_blink_web_unit_test_support.h"
 
 #include "base/callback.h"
 #include "base/feature_list.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 250 matching lines @@
 }
 
 blink::WebString TestBlinkWebUnitTestSupport::DefaultLocale() {
   return blink::WebString::FromASCII("en-US");
 }
 
 blink::WebCompositorSupport* TestBlinkWebUnitTestSupport::CompositorSupport() {
   return &compositor_support_;
 }
 
-std::unique_ptr<blink::WebGestureCurve>
-TestBlinkWebUnitTestSupport::CreateFlingAnimationCurve(
+blink::WebGestureCurve* TestBlinkWebUnitTestSupport::CreateFlingAnimationCurve(
     blink::WebGestureDevice device_source,
     const blink::WebFloatPoint& velocity,
     const blink::WebSize& cumulative_scroll) {
-  return base::MakeUnique<WebGestureCurveMock>(velocity, cumulative_scroll);
+  // Caller will retain and release.
+  return new WebGestureCurveMock(velocity, cumulative_scroll);
 }
 
 blink::WebURLLoaderMockFactory*
 TestBlinkWebUnitTestSupport::GetURLLoaderMockFactory() {
   return url_loader_factory_.get();
 }
 
 blink::WebThread* TestBlinkWebUnitTestSupport::CurrentThread() {
   if (web_thread_ && web_thread_->IsCurrentThread())
     return web_thread_.get();
@@ skipping 35 matching lines @@
             pem_private_key.Utf8(), pem_certificate.Utf8()));
     if (!certificate)
       return nullptr;
     return base::MakeUnique<RTCCertificate>(certificate);
   }
 };
 
 }  // namespace
 #endif  // BUILDFLAG(ENABLE_WEBRTC)
 
-std::unique_ptr<blink::WebRTCCertificateGenerator>
+blink::WebRTCCertificateGenerator*
 TestBlinkWebUnitTestSupport::CreateRTCCertificateGenerator() {
 #if BUILDFLAG(ENABLE_WEBRTC)
-  return base::MakeUnique<TestWebRTCCertificateGenerator>();
+  return new TestWebRTCCertificateGenerator();
 #else
   return nullptr;
 #endif
 }
 
 }  // namespace content