mac: Delete more 10.5-only code

remoting/host/video_frame_capturer_mac.mm

Index: remoting/host/video_frame_capturer_mac.mm
diff --git a/remoting/host/video_frame_capturer_mac.mm b/remoting/host/video_frame_capturer_mac.mm
index 36b82ad24f84ab7d5de7396bd87b27923e7127dd..fce661275b9deb5831a66499e4fed73df87eaa85 100644
--- a/remoting/host/video_frame_capturer_mac.mm
+++ b/remoting/host/video_frame_capturer_mac.mm
@@ -68,13 +68,6 @@ scoped_pixel_buffer_object::~scoped_pixel_buffer_object() {
 
 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_);