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shell_earl_grey.h is converted to be C++ functions in the "shell_test_util"
namespace.  shell_earl_grey_app_interface.h is introduced to contain the
ObjC functions that will eventually make up the EG2 cross-process API.

BUG=922813

Change-Id: Ifb419383e9c1dc2e69327914d00cd749318ff889
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1554053
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648647}