Add missing (and remove superfluous) 'explicit' from constructors.

net/http/http_response_body_drainer_unittest.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/http/http_response_body_drainer.h"
 
 #include <cstring>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 45 matching lines @@
  private:
   int result_;
   bool have_result_;
   bool waiting_for_result_;
 
   DISALLOW_COPY_AND_ASSIGN(CloseResultWaiter);
 };
 
 class MockHttpStream : public HttpStream {
  public:
-  MockHttpStream(CloseResultWaiter* result_waiter)
+  explicit MockHttpStream(CloseResultWaiter* result_waiter)
       : result_waiter_(result_waiter),
         buf_len_(0),
         closed_(false),
         stall_reads_forever_(false),
         num_chunks_(0),
         is_sync_(false),
         is_last_chunk_zero_size_(false),
         is_complete_(false),
         ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {}
   virtual ~MockHttpStream() {}
@@ skipping 236 matching lines @@
 
 TEST_F(HttpResponseBodyDrainerTest, StartWithNothingToDo) {
   mock_stream_->set_num_chunks(0);
   drainer_->StartWithSize(session_, 0);
   EXPECT_FALSE(result_waiter_.WaitForResult());
 }
 
 }  // namespace
 
 }  // namespace net