[gwt-contrib] Clean up JdtCompiler by moving out test-only code. (issue731801)

[scottb]

Reviewers: Keith,



Please review this at http://gwt-code-reviews.appspot.com/731801/show

Affected files:
  M dev/core/src/com/google/gwt/dev/javac/JdtCompiler.java
  M dev/core/test/com/google/gwt/dev/javac/JdtCompilerTest.java


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