Updated OWNERS files to new component as per feedback from rsesek@

Bug: 977050
Change-Id: I8d646c24f67bc07d9653c8b42b4e782aaa4b89c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732690
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683648}

chrome/common/mac/OWNERS

@@ -12,4 +12,4 @@ per-file *.mojom=set noparent
 per-file *.mojom=file://ipc/SECURITY_OWNERS
 per-file *.typemap=set noparent
 per-file *.typemap=file://ipc/SECURITY_OWNERS
-# COMPONENT: UI>Browser>WebAppInstalls
+# COMPONENT: Internals>PlatformIntegration

third_party/google_toolbox_for_mac/OWNERS

 avi@chromium.org
 mark@chromium.org
 rsesek@chromium.org
-# COMPONENT: Platform>Apps>Feedback
+# COMPONENT: UI>Browser