Remove |using base::StringPiece| from net/spdy header files.

net/spdy/spdy_test_utils.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_SPDY_TEST_UTILS_H_
 #define NET_SPDY_TEST_UTILS_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "net/spdy/spdy_header_block.h"
 #include "net/spdy/spdy_protocol.h"
 
 namespace net {
 
 class HashValue;
 class TransportSecurityState;
 
-inline bool operator==(StringPiece x,
+inline bool operator==(base::StringPiece x,
                        const SpdyHeaderBlock::StringPieceProxy& y) {
-  return x == y.operator StringPiece();
+  return x == y.operator base::StringPiece();
 }
 
 namespace test {
 
 std::string HexDumpWithMarks(const unsigned char* data, int length,
                              const bool* marks, int mark_length);
 
 void CompareCharArraysWithHexError(
     const std::string& description,
     const unsigned char* actual,
@@ skipping 21 matching lines @@
 // Adds a pin for |host| to |state|.
 void AddPin(TransportSecurityState* state,
             const std::string& host,
             uint8_t primary_label,
             uint8_t backup_label);
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_SPDY_TEST_UTILS_H_