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

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_SPDY_TEST_UTILS_H_
 #define NET_SPDY_SPDY_TEST_UTILS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <map>
+#include <memory>
+
 #include "net/spdy/platform/api/spdy_string.h"
 #include "net/spdy/platform/api/spdy_string_piece.h"
 #include "net/spdy/server_push_delegate.h"
 #include "net/spdy/spdy_bug_tracker.h"
 #include "net/spdy/spdy_header_block.h"
 #include "net/spdy/spdy_headers_handler_interface.h"
 #include "net/spdy/spdy_protocol.h"
 #include "net/test/gtest_util.h"
 
 #define EXPECT_SPDY_BUG EXPECT_DFATAL
@@ skipping 62 matching lines @@
   SpdyHeaderBlock block_;
   size_t header_bytes_parsed_;
 
   DISALLOW_COPY_AND_ASSIGN(TestHeadersHandler);
 };
 
 // A test implementation of ServerPushDelegate that caches all the pushed
 // request and provides a interface to cancel the push given url.
 class TestServerPushDelegate : public ServerPushDelegate {
  public:
-  explicit TestServerPushDelegate();
+  TestServerPushDelegate();
   ~TestServerPushDelegate() override;
 
   void OnPush(std::unique_ptr<ServerPushHelper> push_helper,
               const NetLogWithSource& session_net_log) override;
 
   bool CancelPush(GURL url);
 
  private:
   std::map<GURL, std::unique_ptr<ServerPushHelper>> push_helpers;
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_TEST_UTILS_H_