- fix http://bugs.webkit.org/show_bug.cgi?id=12273
          REGRESSION: File input value invisible after removing and re-appending

        - made more of the file chooser code cross-platform

        - fixed an Objective-C garbage collection problem in FileChooser

        - tried to remove layering violations where FileChooser in the platform
          directory knows about the rendering and DOM trees (but wasn't able to
          do it entirely)

        * platform/FileChooser.cpp: Added.
        (WebCore::FileChooser::create): Changed parameters.
        (WebCore::FileChooser::chooseFile): Changed to call chooseIcon function.
        (WebCore::FileChooser::chooseIcon): Added.

        * platform/FileChooser.h: Added FileChooserClient so this file doesn't have
        to know about RenderFileUploadControl. Used RetainPtr instead of retain/release
        so this works properly with Objective-C GC. Replaced disconnectUploadControl
        with disconnectClient, which has a simple inline implementation. Moved the
        Document parameter from the constructor to openFileChooser, along with a comment
        about why it should not be there. Added a filename parameter to the constructor
        for the initial filename. Added a font parameter to basenameForWidth so we don't
        depend on having a pointer to the renderer. Removed the uploadControl() and
        document() functions since no one calls either of them.

        * platform/mac/FileChooserMac.mm: Removed code that is now cross-platform.
        (-[OpenPanelController beginSheetWithFrame:]): Added frame parameter, instead
        of storing a document pointer in the FileChooser.
        (WebCore::FileChooser::FileChooser): Updated for changed parameters. Also added
        code to choose the icon based on the initial filename. Pass the adopt parameter
        to the constructor of the RetainPtr.
        (WebCore::FileChooser::~FileChooser): Removed the release call, since the
        RetainPtr will take care of it. Added a call to disconnectFileChooser here.
        There's no need to disconnect at disconnectClient time, and that lets us have
        one more cross-platform function.
        (WebCore::FileChooser::openFileChooser): Added document parameter. Added code
        to get the frame from the document. And added a nil check since there's no
        ironclad guarantee the document won't have outlived its frame.
        (WebCore::FileChooser::basenameForWidth): Added font parameter. Use that instead
        of going at the upload control's style. The caller can handle that now.

        * rendering/RenderFileUploadControl.h: Removed unnecessary includes.
        Made class inherit privately from FileChooserClient. Changed constructor
        parameter to HTMLInputElement rather than Node. Made protected members be
        private instead, and made a couple function members const.
        * rendering/RenderFileUploadControl.cpp: Moved constants to the top of the file,
        but after the "using namespace"
        (WebCore::RenderFileUploadControl::RenderFileUploadControl): Updated for changes
        to the FileChooser::create function and the parameter types.
        (WebCore::RenderFileUploadControl::~RenderFileUploadControl): Removed unneeded
        null check -- there's no case where the FileChooser fails to be created.
        (WebCore::RenderFileUploadControl::click): Pass document to openFileChooser.
        (WebCore::RenderFileUploadControl::updateFromElement): Tweaked code a bit by
        using updateFromElement and setValue instead of casting the renderer to a
        RenderButton and calling setText directly. Put setInputType call here.
        (WebCore::RenderFileUploadControl::maxFilenameWidth): Made const. Broke long line.
        (WebCore::RenderFileUploadControl::createButtonStyle): Made const.
        (WebCore::RenderFileUploadControl::paintObject): Moved buttonShadowHeight constant
        to the top of the file. Call isEmpty instead of checking width and height of
        IntRect for 0. Computed font to pass to FileChooser::basenameForWidth. Broke
        long lines.
        (WebCore::HTMLFileUploadInnerButtonElement::HTMLFileUploadInnerButtonElement):
        Moved the setInputType call to the caller; concept here is that this class is
        as simple as possible, rather than doing as much of the button job as possible.

        * WebCore.xcodeproj/project.pbxproj: Added FileChooser.cpp.
        * WebCore.pro: Ditto.
        * CMakeLists.txt: Ditto.
        * WebCoreSources.bkl: Ditto.

        * platform/gdk/TemporaryLinkStubs.cpp: Updated stubs.
        * platform/qt/FileChooserQt.cpp: Updated stubs.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@19035 268f45cc-cd09-0410-ab3c-d52691b4dbfc