Not for review - Rebase of crrev.com/62833003

Source/platform/WebThreadSupportingGC.cpp

Index: Source/platform/WebThreadSupportingGC.cpp
diff --git a/Source/platform/WebThreadSupportingGC.cpp b/Source/platform/WebThreadSupportingGC.cpp
index b4c3d429d5b7512f94ce3b01f97b78825ec44e2e..e530447a0c75bbaa1e8603ff09ee1d5082a17406 100644
--- a/Source/platform/WebThreadSupportingGC.cpp
+++ b/Source/platform/WebThreadSupportingGC.cpp
@@ -4,6 +4,7 @@
 
 #include "config.h"
 #include "platform/WebThreadSupportingGC.h"
+#include "WebThreadOwnPtr.h"
 
 namespace blink {
 
@@ -13,7 +14,7 @@ PassOwnPtr<WebThreadSupportingGC> WebThreadSupportingGC::create(const char* name
 }
 
 WebThreadSupportingGC::WebThreadSupportingGC(const char* name)
-    : m_thread(adoptPtr(blink::Platform::current()->createThread(name)))
+    : m_thread(new WebThreadOwnPtr(blink::Platform::current()->createThread(name)))
 {
 }
 
@@ -22,7 +23,7 @@ WebThreadSupportingGC::~WebThreadSupportingGC()
     if (ThreadState::current()) {
         // WebThread's destructor blocks until all the tasks are processed.
         ThreadState::SafePointScope scope(ThreadState::HeapPointersOnStack);
-        m_thread.clear();
+        m_thread->clear();
     }
 }