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

content/browser/web_contents/web_contents_view_aura_browsertest.cc

Index: content/browser/web_contents/web_contents_view_aura_browsertest.cc
diff --git a/content/browser/web_contents/web_contents_view_aura_browsertest.cc b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
index af58c885c169d6de4d4afce700e52c3c605b2dee..5815ddbfb1b2198716f8d09a1eff3a3d15fd550a 100644
--- a/content/browser/web_contents/web_contents_view_aura_browsertest.cc
+++ b/content/browser/web_contents/web_contents_view_aura_browsertest.cc
@@ -259,7 +259,7 @@ class WebContentsViewAuraTest : public ContentBrowserTest {
     controller->SetScreenshotManager(screenshot_manager_);
   }
 
-  void SetUpCommandLine(CommandLine* cmd) override {
+  void SetUpCommandLine(base::CommandLine* cmd) override {
     cmd->AppendSwitchASCII(switches::kTouchEvents,
                            switches::kTouchEventsEnabled);
   }