rename nativeFindIsDown to nativeFindIsUp; check for null webkit

     * Clear the highlighting surrounding text matches created by findAll.

     */

    public void clearMatches() {

        if (mNativeClass == 0)

            return;

        if (mFindIsUp) {

            recordNewContentSize(mContentWidth, mContentHeight - mFindHeight,

                    false);

            mFindIsUp = false;

        }

        nativeSetFindIsDown();

        nativeSetFindIsUp();

        // Now that the dialog has been removed, ensure that we scroll to a

        // location that is not beyond the end of the page.

        pinScrollTo(mScrollX, mScrollY, false, 0);

    private native void     nativeRecordButtons(boolean focused,

            boolean pressed, boolean invalidate);

    private native void     nativeSelectBestAt(Rect rect);

    private native void     nativeSetFindIsDown();

    private native void     nativeSetFindIsUp();

    private native void     nativeSetFollowedLink(boolean followed);

    private native void     nativeSetHeightCanMeasure(boolean measure);

    // Returns a value corresponding to CachedFrame::ImeAction