Remove swap ack throttling.

content/browser/compositor/browser_compositor_view_mac.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/browser_compositor_view_mac.h"
 
 #include "base/debug/trace_event.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "content/browser/renderer_host/compositing_iosurface_context_mac.h"
 #include "content/browser/renderer_host/compositing_iosurface_mac.h"
@@ skipping 46 matching lines @@
 - (void)gotSoftwareFrame:(cc::SoftwareFrameData*)frame_data
          withScaleFactor:(float)scale_factor
               withCanvas:(SkCanvas*)canvas {
   DLOG(ERROR) << "-[NSView gotSoftwareFrame] called on non-overridden class.";
 }
 
 @end  // NSView (BrowserCompositorView)
 
 @implementation BrowserCompositorViewMac : NSView
 
-- (id)initWithSuperview:(NSView*)view
-             withClient:(content::BrowserCompositorViewMacClient*)client {
+- (id)initWithSuperview:(NSView*)view {
   if (self = [super init]) {
-    client_ = client;
     helper_.reset(new content::BrowserCompositorViewMacHelper(self));
 
     // Disable the fade-in animation as the layer and view are added.
     ScopedCAActionDisabler disabler;
 
     // Make this view host a transparent layer.
     background_layer_.reset([[CALayer alloc] init]);
     [background_layer_ setContentsGravity:kCAGravityTopLeft];
     [self setLayer:background_layer_];
     [self setWantsLayer:YES];
@@ skipping 53 matching lines @@
   }
 
   // The content area of the software layer is the size of the image provided.
   // Make the bounds of the layer match the superview's bounds, to ensure that
   // the visible contents are drawn.
   [software_layer_ setBounds:new_background_frame];
 }
 
 - (void)resetClient {
   [accelerated_layer_ resetClient];
-  client_ = NULL;
 }
 
 - (ui::Compositor*)compositor {
   return compositor_.get();
 }
 
 - (void)gotAcceleratedIOSurfaceFrame:(uint64)surface_handle
                        withPixelSize:(gfx::Size)pixel_size
                      withScaleFactor:(float)scale_factor {
   ScopedCAActionDisabler disabler;
@@ skipping 79 matching lines @@
 
   // This call can be nested insider ui::Compositor commit calls, and can also
   // make additional ui::Compositor commit calls. Avoid the potential recursion
   // by acknowledging the frame asynchronously.
   [self performSelector:@selector(layerDidDrawFrame)
              withObject:nil
              afterDelay:0];
 }
 
 - (void)layerDidDrawFrame {
-  if (client_)
-    client_->BrowserCompositorDidDrawFrame();
 }
 
 @end  // BrowserCompositorViewMac