Reviewed by Darin Adler.

        Deploy EditingStyle in removeInlineStyleFromElement and removeCSSStyle
        https://bugs.webkit.org/show_bug.cgi?id=54944

        Deployed EditingStyle in removeInlineStyleFromElement and removeCSSStyle.

        Also extracted EditingStyle::conflictsWithInlineStyleOfElement from ApplyStyleCommand::removeCSSStyle,
        which returns true iff the specified element has inline style that conflicts or matches the editing style.
        It also appends conflicting property IDs to the vector of property IDs if one is specified.

        * editing/ApplyStyleCommand.cpp:
        (WebCore::ApplyStyleCommand::applyBlockStyle): Calls removeCSSStyle.
        (WebCore::ApplyStyleCommand::applyInlineStyle): Calls shouldSplitTextElement.
        (WebCore::ApplyStyleCommand::removeStyleFromRunBeforeApplyingStyle): Calls removeInlineStyleFromElement.
        (WebCore::ApplyStyleCommand::removeInlineStyleFromElement): Takes EditingStyle* instead of CSSMutableStyleDeclaration*.
        (WebCore::ApplyStyleCommand::removeCSSStyle): Ditto; extracted the logic to decide properties to remove as
        conflictsWithInlineStyleOfElement.
        (WebCore::ApplyStyleCommand::highestAncestorWithConflictingInlineStyle): Calls shouldRemoveInlineStyleFromElement.
        (WebCore::ApplyStyleCommand::pushDownInlineStyleAroundNode): Calls removeInlineStyleFromElement.
        (WebCore::ApplyStyleCommand::removeInlineStyle): Ditto.
        (WebCore::ApplyStyleCommand::shouldSplitTextElement): Takes EditingStyle* instead of CSSMutableStyleDeclaration*.
        * editing/ApplyStyleCommand.h:
        (WebCore::ApplyStyleCommand::shouldRemoveInlineStyleFromElement): Ditto.
        * editing/EditingStyle.cpp:
        (WebCore::EditingStyle::conflictsWithInlineStyleOfElement): Extracted from ApplyStyleCommand::removeCSSStyle.
        * editing/EditingStyle.h:
        (WebCore::EditingStyle::conflictsWithInlineStyleOfElement): Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@79382 268f45cc-cd09-0410-ab3c-d52691b4dbfc