Fix forward declartion in scene_layer.h.

chrome/browser/android/compositor/scene_layer/scene_layer.h

Index: chrome/browser/android/compositor/scene_layer/scene_layer.h
diff --git a/chrome/browser/android/compositor/scene_layer/scene_layer.h b/chrome/browser/android/compositor/scene_layer/scene_layer.h
index a0cd8674739dbeb438ab8e4aa3b35faf4bc048f6..92cbf58766714fa9a0276842b4a3f2eb7c590199 100644
--- a/chrome/browser/android/compositor/scene_layer/scene_layer.h
+++ b/chrome/browser/android/compositor/scene_layer/scene_layer.h
@@ -11,12 +11,9 @@
 #include "base/android/scoped_java_ref.h"
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "cc/layers/layer.h"
 #include "third_party/skia/include/core/SkColor.h"
 
-namespace cc {
-class Layer;
-}
-
 namespace chrome {
 namespace android {