Revert of [blink] Unique pointers in Platform.h

third_party/WebKit/Source/platform/audio/ReverbConvolver.cpp

Index: third_party/WebKit/Source/platform/audio/ReverbConvolver.cpp
diff --git a/third_party/WebKit/Source/platform/audio/ReverbConvolver.cpp b/third_party/WebKit/Source/platform/audio/ReverbConvolver.cpp
index 22ed564b3d713e0c03c466130618b2c26225470a..e5f1a2e1d0c650f84420568924112cd6f0af398d 100644
--- a/third_party/WebKit/Source/platform/audio/ReverbConvolver.cpp
+++ b/third_party/WebKit/Source/platform/audio/ReverbConvolver.cpp
@@ -137,10 +137,9 @@
   // Start up background thread
   // FIXME: would be better to up the thread priority here.  It doesn't need to
   // be real-time, but higher than the default...
-  if (use_background_threads && background_stages_.size() > 0) {
-    background_thread_ = Platform::Current()->CreateThread(
-        "Reverb convolution background thread");
-  }
+  if (use_background_threads && background_stages_.size() > 0)
+    background_thread_ = WTF::WrapUnique(Platform::Current()->CreateThread(
+        "Reverb convolution background thread"));
 }
 
 ReverbConvolver::~ReverbConvolver() {