Revert "Issue #2721 - Remove nsILinkHandler."

This reverts commit c3f1c0cdba.

layout/base/nsDocumentViewer.cpp

@@ -24,6 +24,7 @@
 #include "nsIWritablePropertyBag2.h"
 #include "nsSubDocumentFrame.h"
 
+#include "nsILinkHandler.h"
 #include "nsIDOMDocument.h"
 #include "nsISelectionListener.h"
 #include "mozilla/dom/Selection.h"

layout/base/nsPresContext.h

@@ -52,6 +52,7 @@ class nsITheme;
 class nsIContent;
 class nsIFrame;
 class nsFrameManager;
+class nsILinkHandler;
 class nsIAtom;
 class nsIRunnable;
 class gfxUserFontEntry;

layout/xul/nsImageBoxFrame.cpp

@@ -3,6 +3,13 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+//
+// Eric Vaughan
+// Netscape Communications
+//
+// See documentation in associated header file
+//
+
 #include "nsImageBoxFrame.h"
 #include "nsGkAtoms.h"
 #include "nsRenderingContext.h"
@@ -19,6 +26,7 @@
 #include "nsIPresShell.h"
 #include "nsIDocument.h"
 #include "nsImageMap.h"
+#include "nsILinkHandler.h"
 #include "nsIURL.h"
 #include "nsILoadGroup.h"
 #include "nsContainerFrame.h"