Fix issue with broken links in HyperlinkTextView.

ui/base/cocoa/controls/hyperlink_text_view.mm

 // Copyright (c) 2011 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.
 
 #import "ui/base/cocoa/controls/hyperlink_text_view.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
 #include "ui/base/cocoa/nsview_additions.h"
 
@@ skipping 36 matching lines @@
 }
 
 // Never draw the insertion point (otherwise, it shows up without any user
 // action if full keyboard accessibility is enabled).
 - (BOOL)shouldDrawInsertionPoint {
   return NO;
 }
 
 - (NSRange)selectionRangeForProposedRange:(NSRange)proposedSelRange
                               granularity:(NSSelectionGranularity)granularity {
-  // Do not allow selections.
-  return NSMakeRange(0, 0);
+  // Return a range of length 0 to prevent text selection. Note that the start
+  // of the range (the first argument) is treated as the position of the
+  // subsequent click so it must not be 0. If it is, links that begin at a
+  // non-zero position in the text will not function correctly when they are
+  // clicked in such a way as to look like a possible text selection.
+  return NSMakeRange(proposedSelRange.location, 0);
 }
 
 // Convince NSTextView to not show an I-Beam cursor when the cursor is over the
 // text view but not over actual text.
 //
 // http://www.mail-archive.com/cocoa-dev@lists.apple.com/msg10791.html
 // "NSTextView sets the cursor over itself dynamically, based on considerations
 // including the text under the cursor. It does so in -mouseEntered:,
 // -mouseMoved:, and -cursorUpdate:, so those would be points to consider
 // overriding."
@@ skipping 97 matching lines @@
   };
 
   [[self textStorage] addAttributes:attributes range:range];
 }
 
 - (void)setRefusesFirstResponder:(BOOL)refusesFirstResponder {
   refusesFirstResponder_ = refusesFirstResponder;
 }
 
 @end