Remove blacklisting of Mac OS 10.6 and 10.7.

content/browser/gpu/compositor_util_browsertest.cc

Index: content/browser/gpu/compositor_util_browsertest.cc
diff --git a/content/browser/gpu/compositor_util_browsertest.cc b/content/browser/gpu/compositor_util_browsertest.cc
index 3bb8eeae20ea4ae97b36b0e96f4421f3a934821a..e4bbd705a568cc74f064d4ec9167e030e51ab154 100644
--- a/content/browser/gpu/compositor_util_browsertest.cc
+++ b/content/browser/gpu/compositor_util_browsertest.cc
@@ -29,8 +29,13 @@ IN_PROC_BROWSER_TEST_F(CompositorUtilTest, CompositingModeAsExpected) {
 #elif defined(OS_ANDROID)
   expected_mode = THREADED;
 #elif defined(OS_MACOSX)
-  if (base::mac::IsOSMountainLionOrLater())
-    expected_mode = THREADED;
+  expected_mode = THREADED;
+  // Lion has compositing blacklisted when using the Apple software renderer,
+  // so results will vary depending if this test is being run in a VM versus
+  // actual hardware.
+  // http://crbug.com/230931
+  if (base::mac::IsOSLion())
+    return;
 #elif defined(OS_WIN)
   if (base::win::GetVersion() >= base::win::VERSION_VISTA)
     expected_mode = THREADED;