[gwt-contrib] Use log(...) instead of log(..., null) for GWT and servlet logs (not TreeLogger)

[rice]

Reviewers: jat,



Please review this at http://gwt-code-reviews.appspot.com/126816

Affected files:
   user/javadoc/com/google/gwt/examples/DateTimeFormatExample.java
   user/javadoc/com/google/gwt/examples/NumberFormatExample.java
   user/src/com/google/gwt/core/client/GWT.java
   user/src/com/google/gwt/user/client/History.java
   user/src/com/google/gwt/user/server/rpc/RemoteServiceServlet.java
   user/test/com/google/gwt/dev/shell/test/MultiModuleTest.java


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