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

webkit/appcache/appcache_request_handler_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 <stack>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 92 matching lines @@
     }
 
   private:
     int response_code_;
     bool has_response_info_;
     net::HttpResponseInfo response_info_;
   };
 
   class MockURLRequest : public net::URLRequest {
    public:
-    explicit MockURLRequest(const GURL& url, net::URLRequestContext* context) :
+    MockURLRequest(const GURL& url, net::URLRequestContext* context) :
         net::URLRequest(url, NULL, context) {
     }
 
     void SimulateResponseCode(int http_response_code) {
       mock_factory_job_ = new MockURLRequestJob(
           this, context()->network_delegate(), http_response_code);
       Start();
       DCHECK(!mock_factory_job_);
       // All our simulation needs  to satisfy are the following two DCHECKs
       DCHECK(status().is_success());
@@ skipping 835 matching lines @@
 
 TEST_F(AppCacheRequestHandlerTest, WorkerRequest) {
   RunTestOnIOThread(&AppCacheRequestHandlerTest::WorkerRequest);
 }
 
 TEST_F(AppCacheRequestHandlerTest, MainResource_Blocked) {
   RunTestOnIOThread(&AppCacheRequestHandlerTest::MainResource_Blocked);
 }
 
 }  // namespace appcache