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

chrome/browser/prefs/proxy_policy_unittest.cc

Index: chrome/browser/prefs/proxy_policy_unittest.cc
diff --git a/chrome/browser/prefs/proxy_policy_unittest.cc b/chrome/browser/prefs/proxy_policy_unittest.cc
index 7e20c33d30e755bb5ac528b7c5fd96c0e8242b8c..b7a5213f4b17c28ddb4529553eb3b073f76f4a3b 100644
--- a/chrome/browser/prefs/proxy_policy_unittest.cc
+++ b/chrome/browser/prefs/proxy_policy_unittest.cc
@@ -81,8 +81,7 @@ void assertProxyModeWithoutParams(const ProxyConfigDictionary& dict,
 
 class ProxyPolicyTest : public testing::Test {
  protected:
-  ProxyPolicyTest()
-      : command_line_(CommandLine::NO_PROGRAM) {}
+  ProxyPolicyTest() : command_line_(base::CommandLine::NO_PROGRAM) {}
 
   void SetUp() override {
     EXPECT_CALL(provider_, IsInitializationComplete(_))
@@ -110,7 +109,7 @@ class ProxyPolicyTest : public testing::Test {
   }
 
   base::MessageLoop loop_;
-  CommandLine command_line_;
+  base::CommandLine command_line_;
   MockConfigurationPolicyProvider provider_;
   scoped_ptr<PolicyServiceImpl> policy_service_;
 };