Fix some net/spdy lint picks, from git cl lint.

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 "net/spdy/header_coalescer.h"
+
+#include <vector>
 
 #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 {
@@ skipping 113 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