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 0e238f8429cbfdda1c13628af7b8bc2d27b54418..7563d09842b4c561a9554dd14815c4c9860e94e2 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.