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

chrome/browser/chrome_process_singleton_win_unittest.cc

Index: chrome/browser/chrome_process_singleton_win_unittest.cc
diff --git a/chrome/browser/chrome_process_singleton_win_unittest.cc b/chrome/browser/chrome_process_singleton_win_unittest.cc
index e9d9759a6764992740595a028d7ce0015c66026a..d56d7a576981baa34470a4f895c847fde6099cad 100644
--- a/chrome/browser/chrome_process_singleton_win_unittest.cc
+++ b/chrome/browser/chrome_process_singleton_win_unittest.cc
@@ -14,13 +14,13 @@
 namespace {
 
 bool ServerCallback(int* callback_count,
-                    const CommandLine& command_line,
+                    const base::CommandLine& command_line,
                     const base::FilePath& current_directory) {
   ++(*callback_count);
   return true;
 }
 
-bool ClientCallback(const CommandLine& command_line,
+bool ClientCallback(const base::CommandLine& command_line,
                     const base::FilePath& current_directory) {
   ADD_FAILURE();
   return false;