Remove explicit keyword from multi-argument constructors

chrome/browser/ui/webui/chrome_url_data_manager_backend.cc

Index: chrome/browser/ui/webui/chrome_url_data_manager_backend.cc
diff --git a/chrome/browser/ui/webui/chrome_url_data_manager_backend.cc b/chrome/browser/ui/webui/chrome_url_data_manager_backend.cc
index 10a0123018b5cc395a02ab5df26a1f1eb60ff72e..cf646ac982f7c153766f1d0e7f94837a531d2c91 100644
--- a/chrome/browser/ui/webui/chrome_url_data_manager_backend.cc
+++ b/chrome/browser/ui/webui/chrome_url_data_manager_backend.cc
@@ -68,8 +68,8 @@ void URLToRequest(const GURL& url, std::string* source_name,
 // calls back once the data is available.
 class URLRequestChromeJob : public net::URLRequestJob {
  public:
-  explicit URLRequestChromeJob(net::URLRequest* request,
-                               ChromeURLDataManagerBackend* backend);
+  URLRequestChromeJob(net::URLRequest* request,
+                      ChromeURLDataManagerBackend* backend);
 
   // net::URLRequestJob implementation.
   virtual void Start() OVERRIDE;