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

content/public/test/test_navigation_observer.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 CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_
 #define CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 29 matching lines @@
   // Run |wait_loop_callback| until complete, then run |done_callback|.
   void WaitForObservation(const base::Closure& wait_loop_callback,
                           const base::Closure& done_callback);
   // Convenient version of the above that runs a nested message loop and waits.
   void Wait();
 
  protected:
   // Note: |js_injection_ready_observer| is owned by the caller and should be
   // valid until this class is destroyed. Subclasses using this constructor MUST
   // call RegisterAsObserver when a NavigationController becomes available.
-  explicit TestNavigationObserver(
-      JsInjectionReadyObserver* js_injection_ready_observer,
-      int number_of_navigations);
+  TestNavigationObserver(JsInjectionReadyObserver* js_injection_ready_observer,
+                         int number_of_navigations);
 
   // Register this TestNavigationObserver as an observer of the |source|.
   void RegisterAsObserver(const NotificationSource& source);
 
  private:
   // NotificationObserver:
   virtual void Observe(int type, const NotificationSource& source,
                        const NotificationDetails& details) OVERRIDE;
 
   NotificationRegistrar registrar_;
@@ skipping 24 matching lines @@
   // |rvho_send_js_| will hold a RenderViewHostObserver subclass to allow
   // JavaScript injection at the appropriate time.
   scoped_ptr<RVHOSendJS> rvho_send_js_;
 
   DISALLOW_COPY_AND_ASSIGN(TestNavigationObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_