Default to enabling the namespace sandbox when possible.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index fc01d8c60cd486e3c0127a807083ef3702a00885..60d342313c934a311b180a8acb092c118156bdd7 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -191,6 +191,9 @@ const char kDisableLogging[]                = "disable-logging";
 // Disables Media Source API (i.e., the MediaSource object).
 const char kDisableMediaSource[]            = "disable-media-source";
 
+// Disables usage of the namespace sandbox.
+const char kDisableNamespaceSandbox[]       = "disable-namespace-sandbox";
+
 // Disable rasterizer that writes directly to GPU memory.
 // Overrides the kEnableOneCopy flag.
 const char kDisableOneCopy[]                = "disable-one-copy";
@@ -357,9 +360,6 @@ const char kEnableLogging[]                 = "enable-logging";
 // Enables the memory benchmarking extension
 const char kEnableMemoryBenchmarking[]      = "enable-memory-benchmarking";
 
-// Prefer the namespace sandbox over the setuid sandbox when possible.
-const char kEnableNamespaceSandbox[]        = "enable-namespace-sandbox";
-
 // Enables the network information API.
 const char kEnableNetworkInformation[]      = "enable-network-information";