AbstractEventProcessorTest: Make inner class static

When all error prone warnings are enabled the ClassCanBeStatic
bug pattern is reported:

  plugins/webhooks/src/test/java/com/googlesource/gerrit/plugins/webhooks/processors/AbstractEventProcessorTest.java:87:
  error: [ClassCanBeStatic] Inner class is non-static but does not reference enclosing class
  private class TestEventProcessor extends AbstractEventProcessor {
          ^
    (see https://errorprone.info/bugpattern/ClassCanBeStatic)

Change-Id: I2059a17858581fbb6215f1cf194e05216ad4a130
1 file changed
tree: 426850e7fbb41c74ba2f22400e0f79a5ffc6901f
  1. .gitignore
  2. BUILD
  3. LICENSE
  4. src/