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

chrome/app_shim/app_mode_loader_mac.mm

Index: chrome/app_shim/app_mode_loader_mac.mm
diff --git a/chrome/app_shim/app_mode_loader_mac.mm b/chrome/app_shim/app_mode_loader_mac.mm
index ba9da17159ff6871e470e20572e6151994939e10..e164c6b36d09c7b80ce6ef7e09f3932668dcd5af 100644
--- a/chrome/app_shim/app_mode_loader_mac.mm
+++ b/chrome/app_shim/app_mode_loader_mac.mm
@@ -149,18 +149,18 @@ int LoadFrameworkAndStart(app_mode::ChromeAppModeInfo* info) {
     return ChromeAppModeStart(info);
 
   LOG(ERROR) << "Loading Chrome failed, launching Chrome with command line";
-  CommandLine command_line(executable_path);
+  base::CommandLine command_line(executable_path);
   // The user_data_dir from the plist is actually the app data dir.
   command_line.AppendSwitchPath(
       switches::kUserDataDir,
       info->user_data_dir.DirName().DirName().DirName());
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           app_mode::kLaunchedByChromeProcessId) ||
       info->app_mode_id == app_mode::kAppListModeId) {
     // Pass --app-shim-error to have Chrome rebuild this shim.
     // If Chrome has rebuilt this shim once already, then rebuilding doesn't fix
     // the problem, so don't try again.
-    if (!CommandLine::ForCurrentProcess()->HasSwitch(
+    if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
             app_mode::kLaunchedAfterRebuild)) {
       command_line.AppendSwitchPath(app_mode::kAppShimError,
                                     app_mode_bundle_path);
@@ -191,7 +191,7 @@ int LoadFrameworkAndStart(app_mode::ChromeAppModeInfo* info) {
 
 __attribute__((visibility("default")))
 int main(int argc, char** argv) {
-  CommandLine::Init(argc, argv);
+  base::CommandLine::Init(argc, argv);
   app_mode::ChromeAppModeInfo info;
 
   // Hard coded info parameters.