Move StringToUpperASCII and LowerCaseEqualsASCII to the base namespace

components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
index 1e20219260b244bb3959d90ba4c105d2fa3bbacd..2079c719dfcd425070ec2b073504f5b170ab4590 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings.cc
@@ -585,10 +585,10 @@ bool DataReductionProxySettings::DisableIfVPN() {
   const std::string vpn_interface_name_prefix = "tun";
   for (size_t i = 0; i < network_interfaces.size(); ++i) {
     std::string interface_name = network_interfaces[i].name;
-    if (LowerCaseEqualsASCII(
-        interface_name.begin(),
-        interface_name.begin() + vpn_interface_name_prefix.size(),
-        vpn_interface_name_prefix.c_str())) {
+    if (base::LowerCaseEqualsASCII(
+            interface_name.begin(),
+            interface_name.begin() + vpn_interface_name_prefix.size(),
+            vpn_interface_name_prefix.c_str())) {
       SetProxyConfigs(false,
                       IsDataReductionProxyAlternativeEnabled(),
                       false,