Move StringPiece into the base namespace. It is colliding

net/base/registry_controlled_domain.cc

 //* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 258 matching lines @@
 void RegistryControlledDomainService::UseDomainData(const std::string& data) {
   RegistryControlledDomainService* instance = GetInstance();
   instance->copied_domain_data_ = data;
   instance->ParseDomainData(instance->copied_domain_data_);
 }
 
 void RegistryControlledDomainService::Init() {
   ParseDomainData(kDomainData);
 }
 
-void RegistryControlledDomainService::ParseDomainData(const StringPiece& data) {
+void RegistryControlledDomainService::ParseDomainData(
+    const base::StringPiece& data) {
   domain_set_.clear();
 
   size_t line_end = 0;
   size_t line_start = 0;
   while (line_start < data.size()) {
     line_end = data.find('\n', line_start);
-    if (line_end == StringPiece::npos)
+    if (line_end == base::StringPiece::npos)
       line_end = data.size();
-    AddRule(StringPiece(data.data() + line_start, line_end - line_start));
+    AddRule(base::StringPiece(data.data() + line_start, line_end - line_start));
     line_start = line_end + 1;
   }
 }
 
-void RegistryControlledDomainService::AddRule(const StringPiece& rule_str) {
+void RegistryControlledDomainService::AddRule(
+    const base::StringPiece& rule_str) {
   DomainEntry rule(rule_str.data(), rule_str.size());
 
   // Valid rules may be either wild or exceptions, but not both.
   if (rule.starts_with("!")) {
     rule.remove_prefix(1);
     rule.attributes.exception = true;
   } else if (rule.starts_with("*.")) {
     rule.remove_prefix(2);
     rule.attributes.wildcard = true;
   }
 
   DomainSet::iterator prev_rule = domain_set_.find(rule);
   if (prev_rule != domain_set_.end()) {
     // We found a rule with the same domain, combine the attributes.
     // This could happen for example when a domain is both a wildcard
     // and an exception (ex *.google.com and !google.com).  Sets are immutable,
     // we'll erase the old one, and insert a new one with the new attributes.
     rule.attributes.Combine(prev_rule->attributes);
     domain_set_.erase(prev_rule);
   }
 
   domain_set_.insert(rule);
 }
 
 }  // namespace net