[gwt-contrib] Updating API checker for GWT 2.3. In CellBasedWidgetImplStandard, I fixed the package declaratio... (issue1356805)

[jlabanca]

Reviewers: rjrjr,

Description:
Updating API checker for GWT 2.3. In CellBasedWidgetImplStandard, I
fixed the package declaration per an Api Checker warning.

Please review this at http://gwt-code-reviews.appspot.com/1356805/show

Affected files:
  M build.xml
  A tools/api-checker/config/gwt22_23userApi.conf
  M tools/api-checker/reference/README
  M  
user/src/com/google/gwt/user/cellview/client/CellBasedWidgetImplStandard.java


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