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

content/browser/web_contents/web_contents_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/logging.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/test_render_view_host.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/browser/web_contents/interstitial_page_impl.h"
@@ skipping 77 matching lines @@
   }
 
  private:
   WebContentsImplTestWebUIControllerFactory factory_;
 };
 
 class TestInterstitialPage;
 
 class TestInterstitialPageDelegate : public InterstitialPageDelegate {
  public:
-  TestInterstitialPageDelegate(TestInterstitialPage* interstitial_page)
+  explicit TestInterstitialPageDelegate(TestInterstitialPage* interstitial_page)
       : interstitial_page_(interstitial_page) {}
   virtual void CommandReceived(const std::string& command) OVERRIDE;
   virtual std::string GetHTMLContents() OVERRIDE { return std::string(); }
   virtual void OnDontProceed() OVERRIDE;
   virtual void OnProceed() OVERRIDE;
  private:
   TestInterstitialPage* interstitial_page_;
 };
 
 class TestInterstitialPage : public InterstitialPageImpl {
@@ skipping 1834 matching lines @@
 
   // And the interstitial should be showing.
   EXPECT_TRUE(other_contents->ShowingInterstitialPage());
 
   // And the interstitial should do a reload on don't proceed.
   EXPECT_TRUE(static_cast<InterstitialPageImpl*>(
       other_contents->GetInterstitialPage())->reload_on_dont_proceed());
 }
 
 }  // namespace content