Remove asMatrix as a JS-exposed method in CSSTransformComponents.

third_party/WebKit/Source/core/css/cssom/CSSRotation.h

Index: third_party/WebKit/Source/core/css/cssom/CSSRotation.h
diff --git a/third_party/WebKit/Source/core/css/cssom/CSSRotation.h b/third_party/WebKit/Source/core/css/cssom/CSSRotation.h
index f4d1827e411fc9a9954517e186deff093c2ae60d..6c3f75db139d950d5419958a2bb3215e48d315dd 100644
--- a/third_party/WebKit/Source/core/css/cssom/CSSRotation.h
+++ b/third_party/WebKit/Source/core/css/cssom/CSSRotation.h
@@ -5,12 +5,13 @@
 #ifndef CSSRotation_h
 #define CSSRotation_h
 
-#include "core/css/cssom/CSSMatrixComponent.h"
 #include "core/css/cssom/CSSNumericValue.h"
 #include "core/css/cssom/CSSTransformComponent.h"
 
 namespace blink {
 
+class DOMMatrix;
+
 class CORE_EXPORT CSSRotation final : public CSSTransformComponent {
   WTF_MAKE_NONCOPYABLE(CSSRotation);
   DEFINE_WRAPPERTYPEINFO();
@@ -42,7 +43,7 @@ class CORE_EXPORT CSSRotation final : public CSSTransformComponent {
     return is2d_ ? kRotationType : kRotation3DType;
   }
 
-  CSSMatrixComponent* asMatrix() const override {
+  DOMMatrix* AsMatrix() const override {
     return nullptr;
     // TODO(meade): Implement.
     // return is2d_