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

components/search_engines/template_url_prepopulate_data_unittest.cc

Index: components/search_engines/template_url_prepopulate_data_unittest.cc
diff --git a/components/search_engines/template_url_prepopulate_data_unittest.cc b/components/search_engines/template_url_prepopulate_data_unittest.cc
index 49eca46b6b961b08305c39db1fed66891d918b1a..15f3b8b56a693d324442ebe52ff7eb3748404d2d 100644
--- a/components/search_engines/template_url_prepopulate_data_unittest.cc
+++ b/components/search_engines/template_url_prepopulate_data_unittest.cc
@@ -343,7 +343,7 @@ TEST_F(TemplateURLPrepopulateDataTest, GetEngineTypeAdvanced) {
   // specified on the command line.
   const std::string foo_url("http://www.foo.com/search?q={searchTerms}");
   EXPECT_EQ(SEARCH_ENGINE_OTHER, GetEngineType(foo_url));
-  CommandLine::ForCurrentProcess()->AppendSwitchASCII(switches::kGoogleBaseURL,
-                                                      "http://www.foo.com/");
+  base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+      switches::kGoogleBaseURL, "http://www.foo.com/");
   EXPECT_EQ(SEARCH_ENGINE_GOOGLE, GetEngineType(foo_url));
 }