Replace skia::RefPtr with sk_sp<> in content/

content/browser/compositor/software_output_device_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/software_output_device_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 123 matching lines @@
 void SoftwareOutputDeviceMac::EndPaint() {
   SoftwareOutputDevice::EndPaint();
   {
     TRACE_EVENT0("browser", "IOSurfaceUnlock");
     IOReturn io_result = IOSurfaceUnlock(io_surfaces_[current_index_],
                                          kIOSurfaceLockAvoidSync, nullptr);
     if (io_result)
       DLOG(ERROR) << "Failed to unlock IOSurface " << io_result;
   }
 
-  canvas_ = nullptr;
+  canvas_.reset();
   base::TimeTicks vsync_timebase;
   base::TimeDelta vsync_interval;
   ui::AcceleratedWidgetMacGotFrame(
       compositor_->widget(), 0, io_surfaces_[current_index_], pixel_size_,
       scale_factor_, &vsync_timebase, &vsync_interval);
   if (!update_vsync_callback_.is_null())
     update_vsync_callback_.Run(vsync_timebase, vsync_interval);
 
   current_index_ = !current_index_;
 }
 
 void SoftwareOutputDeviceMac::DiscardBackbuffer() {
   for (int i = 0; i < 2; ++i)
     io_surfaces_[i].reset();
 }
 
 void SoftwareOutputDeviceMac::EnsureBackbuffer() {}
 
 gfx::VSyncProvider* SoftwareOutputDeviceMac::GetVSyncProvider() {
   return this;
 }
 
 void SoftwareOutputDeviceMac::GetVSyncParameters(
     const gfx::VSyncProvider::UpdateVSyncCallback& callback) {
   update_vsync_callback_ = callback;
 }
 
 }  // namespace content