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This changes is for files in the path //t_p/WebKit/Source/modules/accessibility.

Added the include for base/macros.h where needed and moved the macro to the
end of the class as per the code guidelines enforced by lint.

Also take the chance to change ctor/dtor to use '= default' where possible.

This CL introduces no logic changes.

Bug: 565932
Change-Id: I5b03045c5e880d7a97aa9006e055ea4a065301c3
Reviewed-on: https://chromium-review.googlesource.com/822011Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523370}