Disable linux_aura on the main builders.

ppapi/native_client/tests/breakpad_crash_test/nacl.scons

 # -*- python -*-
 # 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.
 
 import os
 
 Import('env')
 
 if env.Bit('host_windows') or env.Bit('host_mac'):
@@ skipping 65 matching lines @@
     python_tester_script=env.File('crash_dump_tester.py'),
     url='crash_in_syscall.html',
     nmf_names=['crash_in_syscall'],
     files=[GetNexeByName('crash_in_syscall'),
            env.File('crash_in_syscall.html')],
     args=platform_args + ['--expected_crash_dumps=%i' % expected_crash_dumps])
 env.AddNodeToTestSuite(
     node, ['chrome_browser_tests'], 'run_breakpad_crash_in_syscall_test',
     # This test is currently flaky on Win 32 bit on x86, disabling there.
     # See bug: https://code.google.com/p/chromium/issues/detail?id=254583
-    #
-    # These tests are also disabled on linux_aura, pending debugging of why the
-    # GPU process crashes. piman@ thinks it may be a simple flags issue.
-    # See bug: https://code.google.com/p/chromium/issues/detail?id=303342
     is_broken=env.PPAPIBrowserTesterIsBroken() or
                env.Bit('running_on_valgrind') or
-               env.Bit('host_linux') or
                (env.Bit('host_windows') and env.Bit('build_x86_32')))
 
 # Crashes in untrusted code should not produce crash dumps.
 node = env.PPAPIBrowserTester(
     'breakpad_untrusted_crash_test.out',
     python_tester_script=env.File('crash_dump_tester.py'),
     url='untrusted_crash.html',
     nmf_names=['crash_test'],
     files=[GetNexeByName('crash_test'),
            env.File('untrusted_crash.html')],
     args=platform_args + ['--expected_crash_dumps=0'])
 env.AddNodeToTestSuite(
     node, ['chrome_browser_tests'], 'run_breakpad_untrusted_crash_test',
-    # This currently reliably fails in linux_aura configurations, probably for
-    # the same reasons that the previous test fails.
-    #
-    # See bug: https://code.google.com/p/chromium/issues/detail?id=303342
     is_broken=env.PPAPIBrowserTesterIsBroken() or
-               env.Bit('running_on_valgrind') or
-               env.Bit('host_linux'))
+               env.Bit('running_on_valgrind'))