- Fix for http://bugzilla.opendarwin.org/show_bug.cgi?id=10667
          Password: Double-click should select-all to avoid exposing word boundaries

        Test: fast/forms/password-doubleclick-selection.html

        * editing/visible_units.cpp:
        (WebCore::previousBoundary): When searching for boundaries in renderers that use the textSecurity property, 
         convert characters in strings to alpha-numeric characters (in this case, all 'x's) so that every character
         isn't treated as a punctuation boundary.
        (WebCore::nextBoundary): ditto.
        * editing/TextIterator.cpp: (WebCore::SimplifiedBackwardsTextIterator::handleTextNode): Updated to use the renderer's 
          string instead of the node value.  This matches the base class implementation of handleTextNode.

        Code cleanup.
        * editing/ReplaceSelectionCommand.cpp: (WebCore::ReplaceSelectionCommand::doApply): 
          Avoid unnecessary check for password field case if the smart replace condition is false.
        * page/Frame.cpp: (WebCore::Frame::mayCopy): Removed duplicate code.  Calls isSelectionInPasswordField now.
        * rendering/RenderText.cpp: (WebCore::RenderText::setText): Updated formatting.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16192 268f45cc-cd09-0410-ab3c-d52691b4dbfc