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

chrome/browser/metrics/thread_watcher_android.cc

Index: chrome/browser/metrics/thread_watcher_android.cc
diff --git a/chrome/browser/metrics/thread_watcher_android.cc b/chrome/browser/metrics/thread_watcher_android.cc
index e4f80868b50075dff824314b1de36b7ed924fbbe..74aab6a4f99a1e8f285e7c24bd805c154232ecb6 100644
--- a/chrome/browser/metrics/thread_watcher_android.cc
+++ b/chrome/browser/metrics/thread_watcher_android.cc
@@ -33,7 +33,8 @@ void OnApplicationStateChange(
              base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES &&
              g_application_has_stopped) {
     g_application_has_stopped = false;
-    ThreadWatcherList::StartWatchingAll(*CommandLine::ForCurrentProcess());
+    ThreadWatcherList::StartWatchingAll(
+        *base::CommandLine::ForCurrentProcess());
   }
 }