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

net/spdy/spdy_alt_svc_wire_format.h

 // Copyright (c) 2015 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.
 
 // This file contains data structures and utility functions used for serializing
 // and parsing alternative service header values, common to HTTP/1.1 header
 // fields and HTTP/2 and QUIC ALTSVC frames.  See specification at
 // https://httpwg.github.io/http-extensions/alt-svc.html.
 
 #ifndef NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
 #define NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 
-using base::StringPiece;
-
 namespace net {
 
 namespace test {
 class SpdyAltSvcWireFormatPeer;
 }  // namespace test
 
 class NET_EXPORT_PRIVATE SpdyAltSvcWireFormat {
  public:
   using VersionVector = std::vector<uint16>;
 
@@ skipping 24 matching lines @@
              port == other.port && version == other.version &&
              max_age == other.max_age && probability == other.probability;
     }
   };
   // An empty vector means alternative services should be cleared for given
   // origin.  Note that the wire format for this is the string "clear", not an
   // empty value (which is invalid).
   typedef std::vector<AlternativeService> AlternativeServiceVector;
 
   friend class test::SpdyAltSvcWireFormatPeer;
-  static bool ParseHeaderFieldValue(StringPiece value,
+  static bool ParseHeaderFieldValue(base::StringPiece value,
                                     AlternativeServiceVector* altsvc_vector);
   static std::string SerializeHeaderFieldValue(
       const AlternativeServiceVector& altsvc_vector);
 
  private:
-  static void SkipWhiteSpace(StringPiece::const_iterator* c,
-                             StringPiece::const_iterator end);
-  static bool PercentDecode(StringPiece::const_iterator c,
-                            StringPiece::const_iterator end,
+  static void SkipWhiteSpace(base::StringPiece::const_iterator* c,
+                             base::StringPiece::const_iterator end);
+  static bool PercentDecode(base::StringPiece::const_iterator c,
+                            base::StringPiece::const_iterator end,
                             std::string* output);
-  static bool ParseAltAuthority(StringPiece::const_iterator c,
-                                StringPiece::const_iterator end,
+  static bool ParseAltAuthority(base::StringPiece::const_iterator c,
+                                base::StringPiece::const_iterator end,
                                 std::string* host,
                                 uint16* port);
-  static bool ParsePositiveInteger16(StringPiece::const_iterator c,
-                                     StringPiece::const_iterator end,
+  static bool ParsePositiveInteger16(base::StringPiece::const_iterator c,
+                                     base::StringPiece::const_iterator end,
                                      uint16* value);
-  static bool ParsePositiveInteger32(StringPiece::const_iterator c,
-                                     StringPiece::const_iterator end,
+  static bool ParsePositiveInteger32(base::StringPiece::const_iterator c,
+                                     base::StringPiece::const_iterator end,
                                      uint32* value);
-  static bool ParseProbability(StringPiece::const_iterator c,
-                               StringPiece::const_iterator end,
+  static bool ParseProbability(base::StringPiece::const_iterator c,
+                               base::StringPiece::const_iterator end,
                                double* probability);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_