Make callers of CommandLine use it via the base:: namespace.

extensions/common/feature_switch.cc

Index: extensions/common/feature_switch.cc
diff --git a/extensions/common/feature_switch.cc b/extensions/common/feature_switch.cc
index c81a2d29585ae439b212a0fb7cd1ed5da381a45e..1d51b7701bf0ad4d63e5cc0ee260f497943cbab7 100644
--- a/extensions/common/feature_switch.cc
+++ b/extensions/common/feature_switch.cc
@@ -110,16 +110,16 @@ FeatureSwitch::ScopedOverride::~ScopedOverride() {
 
 FeatureSwitch::FeatureSwitch(const char* switch_name,
                              DefaultValue default_value) {
-  Init(CommandLine::ForCurrentProcess(), switch_name, default_value);
+  Init(base::CommandLine::ForCurrentProcess(), switch_name, default_value);
 }
 
-FeatureSwitch::FeatureSwitch(const CommandLine* command_line,
+FeatureSwitch::FeatureSwitch(const base::CommandLine* command_line,
                              const char* switch_name,
                              DefaultValue default_value) {
   Init(command_line, switch_name, default_value);
 }
 
-void FeatureSwitch::Init(const CommandLine* command_line,
+void FeatureSwitch::Init(const base::CommandLine* command_line,
                          const char* switch_name,
                          DefaultValue default_value) {
   command_line_ = command_line;