Remove OwnPtr from Blink.

third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp

Index: third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
diff --git a/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp b/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
index cc641808684bcb19b9db1164b1c765ef08e30d95..a6da4a2eea626e3f9db883cefe145ba285d3401f 100644
--- a/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
+++ b/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
@@ -10,6 +10,7 @@
 #include "core/style/ComputedStyle.h"
 #include "platform/fonts/FontCache.h"
 #include "public/platform/Platform.h"
+#include "wtf/PtrUtil.h"
 
 namespace {
 
@@ -134,7 +135,7 @@ void CanvasFontCache::schedulePruningIfNeeded()
     if (m_pruningScheduled)
         return;
     ASSERT(!m_mainCachePurgePreventer);
-    m_mainCachePurgePreventer = adoptPtr(new FontCachePurgePreventer);
+    m_mainCachePurgePreventer = wrapUnique(new FontCachePurgePreventer);
     Platform::current()->currentThread()->addTaskObserver(this);
     m_pruningScheduled = true;
 }