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There are many places where WTF_MAKE_NONCOPYABLE is transitively defined. This
CL starts replacing these uses with DISALLOW_COPY_AND_ASSIGN and includes
base/macros.h as required.

Where required the declaration of DISALLOW_COPY_AND_ASSIGN is moved to
the end of the class definition.

Also, take the opportunity to use "= default" rather than {} for
ctors and dtors, in line with recent discussions on chromium-cxx@.

There are no logic changes in this CL.

Bug: 565932
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: Idc53c473b134277cc2a079704648f99b3f9d47f1
Reviewed-on: https://chromium-review.googlesource.com/791870Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519533}