mac: Delete more 10.5-only code

ui/gfx/video_decode_acceleration_support_mac_unittest.mm

Index: ui/gfx/video_decode_acceleration_support_mac_unittest.mm
diff --git a/ui/gfx/video_decode_acceleration_support_mac_unittest.mm b/ui/gfx/video_decode_acceleration_support_mac_unittest.mm
index fa73b8367b0ba6c93adfda1e14adac73ef0a3229..5e93be10157bdef5bd5d4bdcadd2ed5436a13833 100644
--- a/ui/gfx/video_decode_acceleration_support_mac_unittest.mm
+++ b/ui/gfx/video_decode_acceleration_support_mac_unittest.mm
@@ -7,7 +7,6 @@
 #import "base/bind.h"
 #include "base/location.h"
 #import "base/mac/foundation_util.h"
-#import "base/mac/mac_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/message_loop.h"
 #import "base/sys_info.h"
@@ -36,9 +35,6 @@ const uint8_t kSampleAVCData[] =  {
 // Check to see if the OS we're running on should have
 // VideoDecodeAcceleration.framework installed.
 bool OSShouldHaveFramework() {
-  if (base::mac::IsOSLeopardOrEarlier())
-    return false;
-
   // 10.6.2 and earlier doesn't have the framework.
   int32 major, minor, bugfix;
   base::SysInfo::OperatingSystemVersionNumbers(&major, &minor, &bugfix);