cc/paint: Remove PaintCanvas::peekPixels.

ui/gfx/canvas_paint_mac.mm

Index: ui/gfx/canvas_paint_mac.mm
diff --git a/ui/gfx/canvas_paint_mac.mm b/ui/gfx/canvas_paint_mac.mm
index ab7dda216fdf965ff89b9ad90a3a8997b2ec1a60..39a4171bfc5a71744045406d46fddb9a4e5d00a1 100644
--- a/ui/gfx/canvas_paint_mac.mm
+++ b/ui/gfx/canvas_paint_mac.mm
@@ -23,20 +23,11 @@ CanvasSkiaPaint::CanvasSkiaPaint(NSRect dirtyRect, bool opaque)
 
 CanvasSkiaPaint::~CanvasSkiaPaint() {
   if (!is_empty()) {
-    cc::PaintCanvas* canvas = sk_canvas();
-    canvas->restoreToCount(1);
+    sk_canvas()->restoreToCount(1);
 
     // Blit the dirty rect to the current context.
-    SkPixmap pixmap;
-    // TODO(enne): make this class record directly into a bitmap and
-    // remove this peekPixels call.
-    bool success = canvas->peekPixels(&pixmap);
-    DCHECK(success);
-    SkBitmap bitmap;
-    success = bitmap.installPixels(pixmap);
-    DCHECK(success);
     CGImageRef image = SkCreateCGImageRefWithColorspace(
-        bitmap, base::mac::GetSystemColorSpace());
+        ToBitmap(), base::mac::GetSystemColorSpace());
     CGRect dest_rect = NSRectToCGRect(rectangle_);
 
     CGContextRef destination_context =