Move CommandLine to base namespace.

chrome/browser/prerender/prerender_field_trial.h

Index: chrome/browser/prerender/prerender_field_trial.h
diff --git a/chrome/browser/prerender/prerender_field_trial.h b/chrome/browser/prerender/prerender_field_trial.h
index 93760ee02e71212eac582cc287ffa668d4d81ddd..9e1c764c1230d4f93b364cc73f0246f41ef79c66 100644
--- a/chrome/browser/prerender/prerender_field_trial.h
+++ b/chrome/browser/prerender/prerender_field_trial.h
@@ -7,15 +7,18 @@
 
 #include <string>
 
-class CommandLine;
 class Profile;
 
+namespace base {
+class CommandLine;
+}
+
 namespace prerender {
 
 // Parse the --prerender= command line switch, which controls prerendering. If
 // the switch is unset or is set to "auto" then the user is assigned to a
 // field trial.
-void ConfigurePrerender(const CommandLine& command_line);
+void ConfigurePrerender(const base::CommandLine& command_line);
 
 // Returns true if the user has opted in or has been opted in to the
 // prerendering from Omnibox experiment.