Reviewed by Darin.

    Reviewed by Darin.
        Landed by David Harrison.

        Test cases added: None.  Fixes existing tests.

        * khtml/ecma/kjs_dom.cpp:
        Attribute values are writable

        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::createAttributeNS):
        Update for new AttrImpl constructor.

        * khtml/xml/dom_elementimpl.cpp:
        (AttributeImpl::allocateImpl):
        Update for new AttrImpl constructor.

        (AttrImpl::AttrImpl):
        Initialize m_ignoreChildCount to 0. If createTextChild.
        is true, create a child text node with the contents
        of the attribute value.

        (AttrImpl::setValue):
        Remove all children and create a new text node with the contents
        of the attribute value.

        (AttrImpl::cloneNode):
        Make sure to clone any children.

        (AttrImpl::childrenChanged):
        If m_ignoreChildrenChanged is 0, update the attribute value.

        * khtml/xml/dom_elementimpl.h:
        Add childrenChanged, update AttrImpl constructor and
        add m_ignoreChildrenChanged to AttrImpl.

        * khtml/xml/dom_nodeimpl.cpp:
        (DOM::NodeImpl::normalize):
        If an element has attributes, make sure to normalize them.

        * layout-tests/dom/html/level1/core/hc_attrappendchild1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrappendchild3-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrappendchild6-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrchildnodes1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrchildnodes2-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrclonenode1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrcreatetextnode-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrfirstchild-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrhaschildnodes-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrinsertbefore1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrinsertbefore2-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrinsertbefore3-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrinsertbefore4-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrlastchild-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrnormalize-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrremovechild1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrreplacechild1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrreplacechild2-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrsetvalue1-expected.txt:
        * layout-tests/dom/html/level1/core/hc_attrsetvalue2-expected.txt:
        * layout-tests/dom/html/level1/core/hc_elementnormalize2-expected.txt:
        These tests pass now.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@10270 268f45cc-cd09-0410-ab3c-d52691b4dbfc