Cleanup: Remove various DoNothing functions and use base::DoNothing().

net/spdy/spdy_stream_test_util.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_STREAM_TEST_UTIL_H_
 #define NET_SPDY_SPDY_STREAM_TEST_UTIL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 70 matching lines @@
   TestCompletionCallback callback_;
   bool send_headers_completed_;
   SpdyHeaderBlock response_headers_;
   SpdyReadQueue received_data_queue_;
 };
 
 // Test delegate that does nothing. Used to capture data about the
 // stream, e.g. its id when it was open.
 class StreamDelegateDoNothing : public StreamDelegateBase {
  public:
-  StreamDelegateDoNothing(const base::WeakPtr<SpdyStream>& stream);
+  explicit StreamDelegateDoNothing(const base::WeakPtr<SpdyStream>& stream);
   ~StreamDelegateDoNothing() override;
 };
 
 // Test delegate that sends data immediately in OnResponseHeadersUpdated().
 class StreamDelegateSendImmediate : public StreamDelegateBase {
  public:
   // |data| can be NULL.
   StreamDelegateSendImmediate(const base::WeakPtr<SpdyStream>& stream,
                               base::StringPiece data);
   ~StreamDelegateSendImmediate() override;
@@ skipping 14 matching lines @@
 
   void OnRequestHeadersSent() override;
 
  private:
   scoped_refptr<StringIOBuffer> buf_;
 };
 
 // Test delegate that closes stream in OnResponseHeadersUpdated().
 class StreamDelegateCloseOnHeaders : public StreamDelegateBase {
  public:
-  StreamDelegateCloseOnHeaders(const base::WeakPtr<SpdyStream>& stream);
+  explicit StreamDelegateCloseOnHeaders(
+      const base::WeakPtr<SpdyStream>& stream);
   ~StreamDelegateCloseOnHeaders() override;
 
   SpdyResponseHeadersStatus OnResponseHeadersUpdated(
       const SpdyHeaderBlock& response_headers) override;
 };
 
 } // namespace test
 
 } // namespace net
 
 #endif // NET_SPDY_SPDY_STREAM_TEST_UTIL_H_