Restore GTM Foundation/GTMIBArray.m to the build

Restore GTM Foundation/GTMIBArray.m to the build

c23cd73367a4 removed this file from the build under the premise that it
was unused, but it's actually referenced by
chrome/app/nibs/FirstRunDialog.xib.

BUG=624850
TEST=Run an official build with a new --user-data-dir, get first run UI

Review-Url: https://codereview.chromium.org/2114123002
Cr-Commit-Position: refs/heads/master@{#403507}
(cherry picked from commit 8262005142234430a1879764a9d84bf26b599661)

Committed: https://chromium.googlesource.com/chromium/src/+/370f1caeb3c2b09b3e9afd5388948a3b4c6466e6

[Mark Mentovai, 2016-07-02 21:47:46]

Description was changed from

==========
Restore GTM Foundation/GTMIBArray.m to the build

c23cd73367a4 removed this file from the build under the premise that it
was unused, but it's actually referenced by
chrome/app/nibs/FirstRunDialog.xib.

BUG=624850
TEST=Run an official build with a new --user-data-dir, get first run UI

Review-Url: https://codereview.chromium.org/2114123002
Cr-Commit-Position: refs/heads/master@{#403507}
(cherry picked from commit 8262005142234430a1879764a9d84bf26b599661)
==========

to

==========
Restore GTM Foundation/GTMIBArray.m to the build

c23cd73367a4 removed this file from the build under the premise that it
was unused, but it's actually referenced by
chrome/app/nibs/FirstRunDialog.xib.

BUG=624850
TEST=Run an official build with a new --user-data-dir, get first run UI

Review-Url: https://codereview.chromium.org/2114123002
Cr-Commit-Position: refs/heads/master@{#403507}
(cherry picked from commit 8262005142234430a1879764a9d84bf26b599661)

Committed:
https://chromium.googlesource.com/chromium/src/+/370f1caeb3c2b09b3e9afd538894...
==========

[Mark Mentovai, 2016-07-02 21:47:47]

Committed patchset #1 (id:1) manually as
370f1caeb3c2b09b3e9afd5388948a3b4c6466e6.