Add @GwtIncompatible to generated DeobfuscatorBuilders

Bug: issue 8565
Change-Id: I0fcedcdbefc0dc7bb794d05daa76e7b8c2f72e6d
Quick fix for gwt26_27userApi.conf

Change-Id: I2220c2a501947c93ff8e0fed8c033cb4965459a3
Removes the unused retry count parameter from GwtRunner

Change-Id: I25377751a226e3426d5bc952247efbb50e162f69
Removes Opera from c.g.gwt.xml.*

Change-Id: I21c8c2a699810cc1ba87e53d5cb5e68f3b2012cc
Review-Link: https://gwt-review.googlesource.com/#/c/6231/
Fixes problems with Menubar where menu item can be left highlighted

Bug: issue 374
Change-Id: I414847954cee6f76aeb740bf7930b743741c275c
Removes deprecated DefaultHandlerRegistration

Change-Id: Iedad69b69d5b903619040e34558942ffa558a639
NPE in UnusedImportsRemover when processing files without definitions.

NPE when a source files contains a package line and at least one
import line but not class nor interface definitions (i.e. empty).

Bug: issue 8566.
Change-Id: I7e1df866af925e8762c4005bacaea85f7d70167b
Merge remote-tracking branch 'upstream/master'