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

Covers chrome/app* and chrome/browser/* through e.

BUG=422426
TEST=none
[email protected]

Review URL: https://codereview.chromium.org/819133004

Cr-Commit-Position: refs/heads/master@{#309476}
diff --git a/chrome/browser/chromeos/profiles/profile_helper.cc b/chrome/browser/chromeos/profiles/profile_helper.cc
index 5f7c3ac3..e66cd56 100644
--- a/chrome/browser/chromeos/profiles/profile_helper.cc
+++ b/chrome/browser/chromeos/profiles/profile_helper.cc
@@ -295,7 +295,7 @@
   // Now these tests will specify special flag to continue working.
   // In future those tests can get a proper CrOS configuration i.e. register
   // and login several users if they want to work with an additional profile.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kIgnoreUserProfileMappingForTests)) {
     return user_manager->GetActiveUser();
   }