Oilpan: move 2D Canvas and WebGL objects to the heap.

Source/core/html/canvas/ANGLEInstancedArrays.h

Index: Source/core/html/canvas/ANGLEInstancedArrays.h
diff --git a/Source/core/html/canvas/ANGLEInstancedArrays.h b/Source/core/html/canvas/ANGLEInstancedArrays.h
index 4bb0657a9dce0da444f8b009b91074f8e39d23ea..7d3ec3884171f4613fee4ee867eec408d3c8b0da 100644
--- a/Source/core/html/canvas/ANGLEInstancedArrays.h
+++ b/Source/core/html/canvas/ANGLEInstancedArrays.h
@@ -40,7 +40,7 @@ class WebGLRenderingContextBase;
 
 class ANGLEInstancedArrays FINAL : public WebGLExtension, public ScriptWrappable {
 public:
-    static PassRefPtr<ANGLEInstancedArrays> create(WebGLRenderingContextBase*);
+    static PassRefPtrWillBeRawPtr<ANGLEInstancedArrays> create(WebGLRenderingContextBase*);
     static bool supported(WebGLRenderingContextBase*);
     static const char* extensionName();
 
@@ -52,7 +52,7 @@ public:
     void vertexAttribDivisorANGLE(GLuint index, GLuint divisor);
 
 private:
-    ANGLEInstancedArrays(WebGLRenderingContextBase*);
+    explicit ANGLEInstancedArrays(WebGLRenderingContextBase*);
 };
 
 } // namespace blink