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

chrome/service/cloud_print/cloud_print_url_fetcher_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 "base/command_line.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/values.h"
@@ skipping 11 matching lines @@
 using base::TimeDelta;
 
 namespace cloud_print {
 
 const FilePath::CharType kDocRoot[] = FILE_PATH_LITERAL("chrome/test/data");
 
 int g_request_context_getter_instances = 0;
 class TrackingTestURLRequestContextGetter
     : public net::TestURLRequestContextGetter {
  public:
-  explicit TrackingTestURLRequestContextGetter(
+  TrackingTestURLRequestContextGetter(
       base::MessageLoopProxy* io_message_loop_proxy,
       net::URLRequestThrottlerManager* throttler_manager)
       : TestURLRequestContextGetter(io_message_loop_proxy),
         throttler_manager_(throttler_manager),
         context_(NULL) {
     g_request_context_getter_instances++;
   }
 
   virtual net::TestURLRequestContext* GetURLRequestContext() OVERRIDE {
     if (!context_.get()) {
@@ skipping 326 matching lines @@
                               FilePath(kDocRoot));
   ASSERT_TRUE(test_server.Start());
 
   GURL url(test_server.GetURL("defaultresponse"));
   CreateFetcher(url, 11);
 
   MessageLoop::current()->Run();
 }
 
 }  // namespace cloud_print