Avoid using WTF threading code in cc

cc/CCScopedTexture.cpp

Index: cc/CCScopedTexture.cpp
diff --git a/cc/CCScopedTexture.cpp b/cc/CCScopedTexture.cpp
index b032680714f59d04a62ae13dc1e5fb063f8d330d..524dfd44eb64e99eb2bf1a95af12637b1333b56a 100644
--- a/cc/CCScopedTexture.cpp
+++ b/cc/CCScopedTexture.cpp
@@ -28,7 +28,7 @@ bool CCScopedTexture::allocate(int pool, const IntSize& size, GC3Denum format, C
     setId(m_resourceProvider->createResource(pool, size, format, hint));
 
 #if !ASSERT_DISABLED
-    m_allocateThreadIdentifier = WTF::currentThread();
+    m_allocateThreadIdentifier = base::PlatformThread::CurrentId();
 #endif
 
     return id();
@@ -37,7 +37,7 @@ bool CCScopedTexture::allocate(int pool, const IntSize& size, GC3Denum format, C
 void CCScopedTexture::free()
 {
     if (id()) {
-        ASSERT(m_allocateThreadIdentifier == WTF::currentThread());
+        ASSERT(m_allocateThreadIdentifier == base::PlatformThread::CurrentId());
         m_resourceProvider->deleteResource(id());
     }
     setId(0);