Re-enable GrContextKeepsGpuChannelAlive test on Mac since 10.6 is gone

content/browser/gpu/gpu_ipc_browsertests.cc

 // Copyright 2013 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 "base/command_line.h"
 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
 #include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
@@ skipping 188 matching lines @@
   bool event = false;
   GetFactory()->EstablishGpuChannel(
       kInitCause,
       base::Bind(&BrowserGpuChannelHostFactoryTest::Signal, &event));
   EXPECT_TRUE(event);
   EXPECT_EQ(gpu_channel.get(), GetGpuChannel());
 }
 #endif
 
 // Test fails on Windows because GPU Channel set-up fails.
-// Mac only fails GPU set-up on MacOS 10.6, but we have no version-specific
-// macros for disabling tests.
-#if !defined(OS_WIN) && !defined(OS_MACOSX)
+#if !defined(OS_WIN)
 #define MAYBE_GrContextKeepsGpuChannelAlive GrContextKeepsGpuChannelAlive
 #else
 #define MAYBE_GrContextKeepsGpuChannelAlive \
     DISABLED_GrContextKeepsGpuChannelAlive
 #endif
 IN_PROC_BROWSER_TEST_F(BrowserGpuChannelHostFactoryTest,
                        MAYBE_GrContextKeepsGpuChannelAlive) {
   // Test for crbug.com/551143
   // This test verifies that holding a reference to the GrContext created by
   // a ContextProviderCommandBuffer will keep the gpu channel alive after the
@@ skipping 57 matching lines @@
   shim->SimulateCrash();
   run_loop.Run();
 
   EXPECT_EQ(1, counter);
   EXPECT_FALSE(IsChannelEstablished());
   EstablishAndWait();
   EXPECT_TRUE(IsChannelEstablished());
 }
 
 }  // namespace content