mac: Remove IsOSLion().

ui/gl/gpu_switching_manager.cc

 // 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 "ui/gl/gpu_switching_manager.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "ui/gl/gl_switches.h"
@@ skipping 79 matching lines @@
     } else {
       // Browser process.
       // We only compute this flag in the browser process.
 #if defined(OS_MACOSX)
       flag = (vendor_ids_.size() == 2);
       if (flag && command_line.HasSwitch(switches::kUseGL) &&
           command_line.GetSwitchValueASCII(switches::kUseGL) !=
             gfx::kGLImplementationDesktopName)
         flag = false;
 
-      if (flag && !base::mac::IsOSLionOrLater())
-        flag = false;
-
       if (flag) {
         // Only advertise that we have two GPUs to the rest of
         // Chrome's code if we find an Intel GPU and some other
         // vendor's GPU. Otherwise we don't understand the
         // configuration and don't deal well with it (an example being
         // the dual AMD GPUs in recent Mac Pros).
         const uint32_t intel = 0x8086;
         flag = ((vendor_ids_[0] == intel && vendor_ids_[1] != intel) ||
                 (vendor_ids_[0] != intel && vendor_ids_[1] == intel));
       }
@@ skipping 35 matching lines @@
     return;
   CGLPixelFormatAttribute attribs[1];
   attribs[0] = static_cast<CGLPixelFormatAttribute>(0);
   GLint num_pixel_formats = 0;
   CGLChoosePixelFormat(attribs, &platform_specific_->discrete_pixel_format,
                        &num_pixel_formats);
 }
 #endif  // OS_MACOSX
 
 }  // namespace ui