third_party/WebKit: fix typos found in comments

third_party/WebKit/Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 201 matching lines @@
         if (securityContext()->isSandboxed(SandboxTopNavigation) && targetFrame == tree().top())
             reason = "The frame attempting navigation of the top-level window is sandboxed, but the 'allow-top-navigation' flag is not set.";
 
         printNavigationErrorMessage(targetFrame, reason);
         return false;
     }
 
     ASSERT(securityContext()->securityOrigin());
     SecurityOrigin& origin = *securityContext()->securityOrigin();
 
-    // This is the normal case. A document can navigate its decendant frames,
+    // This is the normal case. A document can navigate its descendant frames,
     // or, more generally, a document can navigate a frame if the document is
     // in the same origin as any of that frame's ancestors (in the frame
     // hierarchy).
     //
     // See http://www.adambarth.com/papers/2008/barth-jackson-mitchell.pdf for
     // historical information about this security check.
     if (canAccessAncestor(origin, &targetFrame))
         return true;
 
     // Top-level frames are easier to navigate than other frames because they
@@ skipping 80 matching lines @@
 
     if (m_owner) {
         if (m_owner->isLocal())
             toHTMLFrameOwnerElement(m_owner)->setContentFrame(*this);
     } else {
         page()->setMainFrame(this);
     }
 }
 
 } // namespace blink