Pull Up Field.
Two classes have the same field.
Remove the field from subclasses and move it to the superclass.
##Example
##Why Refactor
Subclasses grew and developed separately, causing identical (or nearly identical) fields and methods to appear.
##Benefits
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Eliminates duplication of fields in subclasses.
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Eases subsequent relocation of duplicate methods, if they exist, from subclasses to a superclass.
##How to Refactor
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Make sure that the fields are used for the same needs in subclasses.
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If the fields have different names, give them the same name and replace all references to the fields in existing code.
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Create a field with the same name in the superclass. Note that if the fields were private, the superclass field should be protected.
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Remove the fields from the subclasses.
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You may want to consider using Self Encapsulate Field for the new field, in order to hide it behind access methods.
