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

chrome/browser/spellchecker/feedback_sender_unittest.cc

Index: chrome/browser/spellchecker/feedback_sender_unittest.cc
diff --git a/chrome/browser/spellchecker/feedback_sender_unittest.cc b/chrome/browser/spellchecker/feedback_sender_unittest.cc
index 6c278a9c5da48c7de6e51aa578f43be1de1dcac2..5f6963d6aa00bc47a5c4e50afdad5b812e789854 100644
--- a/chrome/browser/spellchecker/feedback_sender_unittest.cc
+++ b/chrome/browser/spellchecker/feedback_sender_unittest.cc
@@ -74,7 +74,7 @@ class FeedbackSenderTest : public testing::Test {
   void AppendCommandLineSwitch() {
     // The command-line switch is temporary.
     // TODO(rouslan): Remove the command-line switch. http://crbug.com/247726
-    CommandLine::ForCurrentProcess()->AppendSwitch(
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kEnableSpellingFeedbackFieldTrial);
     feedback_.reset(new FeedbackSender(NULL, kLanguage, kCountry));
     feedback_->StartFeedbackCollection();