Disable PDFBrowserTest.Basic on Mac, as it's consistently failing on Mac Chrome release builder

chrome/browser/ui/pdf/pdf_browsertest.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 "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 182 matching lines @@
   FilePath snapshot_filename_;
   // How many times we've seen chrome::LOAD_STOP.
   int load_stop_notification_count_;
 
   scoped_ptr<net::TestServer> pdf_test_server_;
 };
 
 #if defined(OS_CHROMEOS)
 // TODO(sanjeevr): http://crbug.com/79837
 #define MAYBE_Basic DISABLED_Basic
+#elif defined(OS_MACOSX)
+// Fails on release builder for Mac: http://crbug.com/142531
+#define MAYBE_Basic DISABLED_Basic
 #else
 #define MAYBE_Basic Basic
 #endif
 // Tests basic PDF rendering.  This can be broken depending on bad merges with
 // the vendor, so it's important that we have basic sanity checking.
 IN_PROC_BROWSER_TEST_F(PDFBrowserTest, MAYBE_Basic) {
   ASSERT_NO_FATAL_FAILURE(Load());
   ASSERT_NO_FATAL_FAILURE(WaitForResponse());
   // OS X uses CoreText, and FreeType renders slightly different on Linux and
   // Win.
@@ skipping 141 matching lines @@
       chrome::GetActiveWebContents(browser())->GetRenderViewHost(),
       std::wstring(),
       L"reloadPDF();"));
   observer.Wait();
 
   ASSERT_EQ("success",
             chrome::GetActiveWebContents(browser())->GetURL().query());
 }
 
 }  // namespace