[merge to 3809] Dismiss consent dialog on Android on page navigation

TBR=bsheedy@chromium.org
TBR=mthiesse@chromium.org

Bug: 968802
Change-Id: I934004dcd1b9069d5164b8f6dfccbe184f3f98c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649637
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Commit-Queue: Suman Kancherla <sumankancherla@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#668168}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1657188
Cr-Commit-Position: refs/branch-heads/3809@{#273}
Cr-Branched-From: d82dec1a818f378c464ba307ddd9c92133eac355-refs/heads/master@{#665002}

• chrome/android/features/vr/java/src/org/chromium/chrome/browser/vr/VrConsentDialog.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/vr/WebXrVrTestFramework.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/vr/WebXrVrTransitionTest.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/vr/util/PermissionUtils.java[diff]
• chrome/browser/android/vr/gvr_consent_helper_impl.cc[diff]
• chrome/browser/android/vr/gvr_consent_helper_impl.h[diff]