Fix the permanent back trapping using same document entries

This fix enhances the history manipulation intervention such that
same document entries cannot be used to achieve permanent back trapping.
The original intervention stops working when there is a user activation
which does not get cleared after the user goes back and forth between
same document entries. So creating new same document entries becomes a
way to hijack the back button. This enhancement fixes the following
scenario:
1. History contains [new-tab-page, a*]
2. A gets a click and adds a same-document entry a1 =>
   [new-tab-page, a, a1*]
3. User goes back to a via the back button
   [new-tab-page, a*, a1]
4. Without any new user activation, a adds another new same document
   entry a2. Page a should now be marked as skippable.
   [new-tab-page, a(skip), a2*]
5. Now when the user goes back, they should land on new-tab-page.

Bug: 1248529
Change-Id: I6de52ab75aef151abd65d4a02de56bd7f791eb19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3182862
Commit-Queue: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1248715}