Reviewed by Alice.

    Reviewed by Alice.

        - moved WebFormState into Loader directory and tweaked to void WebKit dependencies

        * Loader/WebDocumentLoader.h:
        * Loader/WebFormState.h: Added.
        * Loader/WebFormState.m: Added.
        (-[WebFormState initWithForm:values:sourceFrame:]):
        (-[WebFormState dealloc]):
        (-[WebFormState form]):
        (-[WebFormState values]):
        (-[WebFormState sourceFrame]):
        * Loader/WebFrameLoader.h:
        * Loader/WebFrameLoader.m:
        (-[WebFrameLoader loadURL:referrer:loadType:target:triggeringEvent:form:formValues:]):
        (-[WebFrameLoader continueLoadRequestAfterNavigationPolicy:formState:]):
        (-[WebFrameLoader postWithURL:referrer:target:data:contentType:triggeringEvent:form:formValues:]):
        * WebKit.xcodeproj/project.pbxproj:
        * WebView/WebFrame.m:
        * WebView/WebFrameInternal.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@16926 268f45cc-cd09-0410-ab3c-d52691b4dbfc