mac: Delete more 10.5-only code

remoting/host/video_frame_capturer_mac.mm

 // Copyright (c) 2012 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 "remoting/host/video_frame_capturer.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <Cocoa/Cocoa.h>
 #include <dlfcn.h>
 #include <IOKit/pwr_mgt/IOPMLib.h>
@@ skipping 50 matching lines @@
     : cgl_context_(NULL),
       pixel_buffer_object_(0) {
 }
 
 scoped_pixel_buffer_object::~scoped_pixel_buffer_object() {
   Release();
 }
 
 bool scoped_pixel_buffer_object::Init(CGLContextObj cgl_context,
                                       int size_in_bytes) {
-  // The PBO path is only done on 10.6 (SnowLeopard) and above due to
-  // a driver issue that was found on 10.5
-  // (specifically on a NVIDIA GeForce 7300 GT).
-  // http://crbug.com/87283
-  if (base::mac::IsOSLeopardOrEarlier()) {
-    return false;
-  }
   cgl_context_ = cgl_context;
   CGLContextObj CGL_MACRO_CONTEXT = cgl_context_;
   glGenBuffersARB(1, &pixel_buffer_object_);
   if (glGetError() == GL_NO_ERROR) {
     glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, pixel_buffer_object_);
     glBufferDataARB(GL_PIXEL_PACK_BUFFER_ARB, size_in_bytes, NULL,
                     GL_STREAM_READ_ARB);
     glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, 0);
     if (glGetError() != GL_NO_ERROR) {
       Release();
@@ skipping 683 matching lines @@
 VideoFrameCapturer* VideoFrameCapturer::Create() {
   VideoFrameCapturerMac* capturer = new VideoFrameCapturerMac();
   if (!capturer->Init()) {
     delete capturer;
     capturer = NULL;
   }
   return capturer;
 }
 
 }  // namespace remoting