Move StringPiece into the base namespace. It is colliding

net/http/http_util.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The rules for parsing content-types were borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_util.h"
 
 #include <algorithm>
@@ skipping 482 matching lines @@
 
   // Can't start with LWS (this would imply the segment is a continuation)
   if (HttpUtil::IsLWS(*name_begin))
     return false;
 
   return true;
 }
 
 // Helper used by AssembleRawHeaders, to find the end of the status line.
 static const char* FindStatusLineEnd(const char* begin, const char* end) {
-  size_t i = StringPiece(begin, end - begin).find_first_of("\r\n");
-  if (i == StringPiece::npos)
+  size_t i = base::StringPiece(begin, end - begin).find_first_of("\r\n");
+  if (i == base::StringPiece::npos)
     return end;
   return begin + i;
 }
 
 // Helper used by AssembleRawHeaders, to skip past leading LWS.
 static const char* FindFirstNonLWS(const char* begin, const char* end) {
   for (const char* cur = begin; cur != end; ++cur) {
     if (!HttpUtil::IsLWS(*cur))
       return cur;
   }
@@ skipping 156 matching lines @@
     TrimLWS(&value_begin_, &value_end_);
 
     // bypass empty values.
     if (value_begin_ != value_end_)
       return true;
   }
   return false;
 }
 
 }  // namespace net