remove (dumb) canvas::NewRaster, and rename surface::NewRasterPMColor to N32Premul

include/core/SkSurface.h

Index: include/core/SkSurface.h
diff --git a/include/core/SkSurface.h b/include/core/SkSurface.h
index 62d2252af1472f108b4ba06a49b5284cb12a05e7..8b36314360160c0ee09cca36dad5e417723ccea6 100644
--- a/include/core/SkSurface.h
+++ b/include/core/SkSurface.h
@@ -61,9 +61,14 @@ public:
      *  specified width and height, and populates the rest of info to match
      *  pixels in SkPMColor format.
      */
+#ifdef SK_SUPPORT_LEGACY_NewRasterPMColor
     static SkSurface* NewRasterPMColor(int width, int height, const SkSurfaceProps* props = NULL) {
         return NewRaster(SkImageInfo::MakeN32Premul(width, height), props);
     }
+#endif
+    static SkSurface* NewRasterN32Premul(int width, int height, const SkSurfaceProps* props = NULL) {
+        return NewRaster(SkImageInfo::MakeN32Premul(width, height), props);
+    }
 
     /**
      *  Return a new surface using the specified render target.