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

content/browser/web_contents/navigation_controller_impl_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/basictypes.h"
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "base/stl_util.h"
@@ skipping 138 matching lines @@
   tracker->ListenFor(NOTIFICATION_NAV_ENTRY_CHANGED,
                      Source<NavigationController>(controller));
 }
 
 SiteInstance* GetSiteInstanceFromEntry(NavigationEntry* entry) {
   return NavigationEntryImpl::FromNavigationEntry(entry)->site_instance();
 }
 
 class TestWebContentsDelegate : public WebContentsDelegate {
  public:
-  explicit TestWebContentsDelegate() :
+  TestWebContentsDelegate() :
       navigation_state_change_count_(0) {}
 
   int navigation_state_change_count() {
     return navigation_state_change_count_;
   }
 
   // Keep track of whether the tab has notified us of a navigation state change.
   virtual void NavigationStateChanged(const WebContents* source,
                                       unsigned changed_flags) {
     navigation_state_change_count_++;
@@ skipping 767 matching lines @@
   EXPECT_EQ(controller.GetLastCommittedEntryIndex(), 1);
   EXPECT_EQ(controller.GetPendingEntryIndex(), -1);
   EXPECT_TRUE(controller.GetLastCommittedEntry());
   EXPECT_FALSE(controller.GetPendingEntry());
   EXPECT_TRUE(controller.CanGoBack());
   EXPECT_FALSE(controller.CanGoForward());
 }
 
 class TestNavigationObserver : public RenderViewHostObserver {
  public:
-  TestNavigationObserver(RenderViewHost* render_view_host)
+  explicit TestNavigationObserver(RenderViewHost* render_view_host)
       : RenderViewHostObserver(render_view_host) {
   }
 
   const GURL& navigated_url() const {
     return navigated_url_;
   }
 
  protected:
   virtual void Navigate(const GURL& url) OVERRIDE {
     navigated_url_ = url;
@@ skipping 2232 matching lines @@
                     PAGE_TRANSITION_LINK);
   session_helper_.AssertNavigationEquals(nav,
                                          windows_[0]->tabs[0]->navigations[0]);
   nav.set_url(url2);
   session_helper_.AssertNavigationEquals(nav,
                                          windows_[0]->tabs[0]->navigations[1]);
 }
 */
 
 }  // namespace content