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

chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc

Index: chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
diff --git a/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc b/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
index 1cc1be6809ee51863d0003a8f473c1ae7c6bc6e0..63445b8ae1741798fc91f14964137b23ce1f164e 100644
--- a/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
+++ b/chrome/browser/net/pref_proxy_config_tracker_impl_unittest.cc
@@ -326,7 +326,7 @@ class PrefProxyConfigTrackerImplCommandLineTest
           testing::TestWithParam<CommandLineTestParams> > {
  protected:
   PrefProxyConfigTrackerImplCommandLineTest()
-      : command_line_(CommandLine::NO_PROGRAM) {}
+      : command_line_(base::CommandLine::NO_PROGRAM) {}
 
   void SetUp() override {
     for (size_t i = 0; i < arraysize(GetParam().switches); i++) {
@@ -345,7 +345,7 @@ class PrefProxyConfigTrackerImplCommandLineTest
   }
 
  private:
-  CommandLine command_line_;
+  base::CommandLine command_line_;
   scoped_ptr<PrefService> pref_service_;
 };