Add skia::RefPtr class to wrap ref counted classes from Skia.

skia/ext/vector_platform_device_emf_win.cc

Index: skia/ext/vector_platform_device_emf_win.cc
diff --git a/skia/ext/vector_platform_device_emf_win.cc b/skia/ext/vector_platform_device_emf_win.cc
index 243e80876d61738a6c80286eb5212ca8f41a19a5..6d8fbee3b083b9ca733f16ca90caea18cfe9e5ac 100644
--- a/skia/ext/vector_platform_device_emf_win.cc
+++ b/skia/ext/vector_platform_device_emf_win.cc
@@ -190,7 +190,7 @@ void VectorPlatformDeviceEmf::drawRect(const SkDraw& draw,
 
     // Removes the path effect from the temporary SkPaint object.
     SkPaint paint_no_effet(paint);
-    SkSafeUnref(paint_no_effet.setPathEffect(NULL));
+    paint_no_effet.setPathEffect(NULL);
 
     // Draw the calculated path.
     drawPath(draw, path_modified, paint_no_effet);
@@ -224,7 +224,7 @@ void VectorPlatformDeviceEmf::drawPath(const SkDraw& draw,
 
     // Removes the path effect from the temporary SkPaint object.
     SkPaint paint_no_effet(paint);
-    SkSafeUnref(paint_no_effet.setPathEffect(NULL));
+    paint_no_effet.setPathEffect(NULL);
 
     // Draw the calculated path.
     drawPath(draw, path_modified, paint_no_effet);