Add SpdyString alias for std::string in net/spdy.

net/spdy/header_coalescer_test.cc

 // Copyright 2016 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 "header_coalescer.h"
 
-#include <string>
-
+#include "net/spdy/platform/api/spdy_string.h"
 #include "net/spdy/platform/api/spdy_string_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::ElementsAre;
 using ::testing::Pair;
 
 namespace net {
 namespace test {
 
@@ skipping 15 matching lines @@
 
 TEST_F(HeaderCoalescerTest, EmptyHeaderKey) {
   EXPECT_FALSE(header_coalescer_.error_seen());
   header_coalescer_.OnHeader("", "foo");
   EXPECT_TRUE(header_coalescer_.error_seen());
 }
 
 TEST_F(HeaderCoalescerTest, HeaderBlockTooLarge) {
   // 3 byte key, 256 * 1024 - 40 byte value, 32 byte overhead:
   // less than 256 * 1024 bytes in total.
-  std::string data(256 * 1024 - 40, 'a');
+  SpdyString data(256 * 1024 - 40, 'a');
   header_coalescer_.OnHeader("foo", data);
   EXPECT_FALSE(header_coalescer_.error_seen());
 
   // Another 3 + 3 + 32 bytes: too large.
   header_coalescer_.OnHeader("bar", "baz");
   EXPECT_TRUE(header_coalescer_.error_seen());
 }
 
 TEST_F(HeaderCoalescerTest, PseudoHeadersMustNotFollowRegularHeaders) {
   header_coalescer_.OnHeader("foo", "bar");
@@ skipping 75 matching lines @@
       header_block,
       ElementsAre(Pair("foo_0", SpdyStringPiece(header_values[0].data(),
                                                 header_values[0].size())),
                   Pair("foo_1", SpdyStringPiece(header_values[1].data(),
                                                 header_values[1].size()))));
 }
 
 }  // namespace test
 
 }  // namespace net