Remove downstream NQE monitoring

This is no longer used and can be removed.

(cherry picked from commit e7918bac25137dcd0771e1df0ebeaf6bcd753603)

Bug: 974298
Change-Id: I485dffcc549e202bde603af75613e0803bb12f8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660701
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#669353}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1661764
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/branch-heads/3770@{#1023}
Cr-Branched-From: a9eee1c7c727ef42a15d86e9fa7b77ff0e63840a-refs/heads/master@{#652427}

• chrome/android/java/src/org/chromium/chrome/browser/AppHooks.java[diff]
• chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java[diff]