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

webkit/tools/test_shell/test_shell_platform_delegate.h

 // Copyright (c) 2009 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.
 
 // TestShellPlatformDelegate isolates a variety of platform-specific
 // functions so that code can invoke them by purpose without resorting to
 // ifdefs or runtime platform checks.  Each platform should define an
 // implementation of this class.  In many cases, implementation of methods
 // in this class will be stubs on platforms where those functions are
 // unnecessary.
 
 class TestShellPlatformDelegate {
  public:
   // The TestShellPlatformDelegate object is scoped to main(), and so
   // its constructor is a good place to put per-application initialization
   // (as opposed to per-test code, which should go into the TestShell class).
-  TestShellPlatformDelegate(const CommandLine& command_line);
+  explicit TestShellPlatformDelegate(const CommandLine& command_line);
   ~TestShellPlatformDelegate();
 
   // CheckLayoutTestSystemDependencies: check for any system dependencies that
   // can't be easily overridden from within an application (for example, UI or
   // display settings).  Returns false if any dependencies are not met.
   bool CheckLayoutTestSystemDependencies();
 
   // PreflightArgs: give the platform first crack at the arguments to main()
   // before we parse the command line.  For example, some UI toolkits have
   // runtime flags that they can pre-filter.
@@ skipping 17 matching lines @@
   // abort() (example: test timeouts).
   void AboutToExit();
 
   // SetWindowPositionForRecording: if the platform's implementation of
   // EventRecorder requires the window to be in a particular absolute position,
   // make it so.  This is called by TestShell after it creates the window.
   void SetWindowPositionForRecording(TestShell *shell);
  private:
   const CommandLine& command_line_;
 };