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

net/spdy/spdy_header_block_test.cc

 // 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.
 
 #include "net/spdy/spdy_header_block.h"
 
 #include <utility>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "net/log/net_log.h"
 #include "net/spdy/spdy_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using std::make_pair;
 using std::string;
 using ::testing::ElementsAre;
 
 namespace net {
 
-std::pair<StringPiece, StringPiece> Pair(StringPiece k, StringPiece v) {
+std::pair<base::StringPiece, base::StringPiece> Pair(base::StringPiece k,
+                                                     base::StringPiece v) {
   return make_pair(k, v);
 }
 
 // This test verifies that SpdyHeaderBlock behaves correctly when empty.
 TEST(SpdyHeaderBlockTest, EmptyBlock) {
   SpdyHeaderBlock block;
   EXPECT_TRUE(block.empty());
   EXPECT_EQ(0u, block.size());
   EXPECT_EQ(block.end(), block.find("foo"));
   EXPECT_TRUE(block.end() == block.begin());
@@ skipping 44 matching lines @@
 
   scoped_ptr<base::Value> event_param(SpdyHeaderBlockNetLogCallback(
       &headers, NetLogCaptureMode::IncludeCookiesAndCredentials()));
 
   SpdyHeaderBlock headers2;
   ASSERT_TRUE(SpdyHeaderBlockFromNetLogParam(event_param.get(), &headers2));
   EXPECT_EQ(headers, headers2);
 }
 
 }  // namespace net