[oilpan]: fix deadlock when leaving a safepoint and sweeping.

Source/platform/heap/ThreadState.h

Index: Source/platform/heap/ThreadState.h
diff --git a/Source/platform/heap/ThreadState.h b/Source/platform/heap/ThreadState.h
index 1aa6c22a49eed2bb935fcbb51d62600867150590..0d65220325252008be6a1771f4421be97ad8e4c6 100644
--- a/Source/platform/heap/ThreadState.h
+++ b/Source/platform/heap/ThreadState.h
@@ -618,7 +618,7 @@ public:
 class SafePointAwareMutexLocker {
     WTF_MAKE_NONCOPYABLE(SafePointAwareMutexLocker);
 public:
-    explicit SafePointAwareMutexLocker(Mutex& mutex, ThreadState::StackState stackState = ThreadState::HeapPointersOnStack)
+    explicit SafePointAwareMutexLocker(WTF::MutexBase& mutex, ThreadState::StackState stackState = ThreadState::HeapPointersOnStack)

[tkent, 2014/07/25 05:11:44]

We should omit WTF::

[wibling-chromium, 2014/07/25 09:31:28]

Done.

         : m_mutex(mutex)
         , m_locked(false)
     {
@@ -661,7 +661,7 @@ private:
         m_locked = false;
     }
 
-    Mutex& m_mutex;
+    WTF::MutexBase& m_mutex;

[tkent, 2014/07/25 05:11:44]

Ditto.

[wibling-chromium, 2014/07/25 09:31:28]

Done.

     bool m_locked;
 };