ui/gfx: Rename almost all entries from gfx::CanvasSkia to gfx::Canvas.

ash/app_list/drop_shadow_label.cc

Index: ash/app_list/drop_shadow_label.cc
diff --git a/ash/app_list/drop_shadow_label.cc b/ash/app_list/drop_shadow_label.cc
index 169890f0c520d2c34f6131a5f4f93ba157565c52..de1c90ffbaa240160dc2812f12ac68e7381629f4 100644
--- a/ash/app_list/drop_shadow_label.cc
+++ b/ash/app_list/drop_shadow_label.cc
@@ -40,7 +40,7 @@ void DropShadowLabel::PaintText(gfx::Canvas* canvas,
     // when transfering contents on this canvas to target canvas.
     gfx::Size canvas_size(text_bounds.width() + drop_shadow_size_,
                           text_bounds.height() + drop_shadow_size_);
-    gfx::CanvasSkia text_canvas(canvas_size, false);
+    gfx::Canvas text_canvas(canvas_size, false);
 
     const double kShadowOpacity = 0.2;
     const SkColor shadow_color =
@@ -84,7 +84,7 @@ void DropShadowLabel::PaintText(gfx::Canvas* canvas,
       SkPaint paint;
       paint.setShader(s)->unref();
 
-      gfx::CanvasSkia alpha_canvas(canvas_size, false);
+      gfx::Canvas alpha_canvas(canvas_size, false);
       alpha_canvas.DrawRect(gfx::Rect(canvas_size), paint);
 
       const SkBitmap& alpha_bitmap = const_cast<SkBitmap&>(