linux: enable seccomp sandbox by default

chrome/common/chrome_switches.h

 // Copyright (c) 2010 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 79 matching lines @@
 extern const char kEnableGPURendering[];
 extern const char kEnableIndexedDatabase[];
 extern const char kEnableInternalFlash[];
 extern const char kEnableIPv6[];
 extern const char kEnableLogging[];
 extern const char kEnableMonitorProfile[];
 extern const char kEnableNaCl[];
 extern const char kEnableNativeWebWorkers[];
 extern const char kEnablePrivacyBlacklists[];
 extern const char kEnableRendererAccessibility[];
-extern const char kEnableSeccompSandbox[];
 extern const char kEnableStatsTable[];
 extern const char kEnableSync[];
 extern const char kEnableSyncAutofill[];
 extern const char kEnableSyncBookmarks[];
 extern const char kEnableSyncPreferences[];
 extern const char kEnableSyncThemes[];
 extern const char kEnableSyncTypedUrls[];
 extern const char kEnableUserDataDirProfiles[];
 extern const char kEnableUserStyleSheet[];
 extern const char kEnableVerticalTabs[];
@@ skipping 150 matching lines @@
 #ifndef NDEBUG
 extern const char kGearsPluginPathOverride[];
 extern const char kInvalidateSyncLogin[];
 extern const char kInvalidateSyncXmppLogin[];
 #endif
 
 #if !defined(OFFICIAL_BUILD)
 extern const char kRendererCheckFalseTest[];
 #endif
 
+#if defined(USE_SECCOMP_SANDBOX)
+extern const char kDisableSeccompSandbox[];
+#else
+extern const char kEnableSeccompSandbox[];
+#endif
+// Return true if the switches indicate the seccomp sandbox is enabled.
+bool SeccompSandboxEnabled();
+
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_