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

extensions/common/manifest_handlers/background_info.cc

Index: extensions/common/manifest_handlers/background_info.cc
diff --git a/extensions/common/manifest_handlers/background_info.cc b/extensions/common/manifest_handlers/background_info.cc
index 230eba13745a4a55ff76581869e8e83cf58f729f..3d575682f504317e7e9b01612af2664e3743da39 100644
--- a/extensions/common/manifest_handlers/background_info.cc
+++ b/extensions/common/manifest_handlers/background_info.cc
@@ -170,8 +170,8 @@ bool BackgroundInfo::LoadBackgroundPage(const Extension* extension,
     }
 
     if (!(background_url_.SchemeIs("https") ||
-          (CommandLine::ForCurrentProcess()->HasSwitch(
-              switches::kAllowHTTPBackgroundPage) &&
+          (base::CommandLine::ForCurrentProcess()->HasSwitch(
+               switches::kAllowHTTPBackgroundPage) &&
            background_url_.SchemeIs("http")))) {
       *error = ASCIIToUTF16(errors::kInvalidBackgroundInHostedApp);
       return false;