[jumbo] Rename two WebContentsLifetimeHelper in chrome/browser

In some extreme jumbo builds two WebContentsLifetimeHelper classes
ended up in the same translation unit and cause class lookup
problems. To avoid that, this patch gives them unique
(non-imaginative) names.

Bug: 924823
Change-Id: I7a6f6a68430a3bee87595ee4a7319c4a97737a31
Reviewed-on: https://chromium-review.googlesource.com/c/1455902
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#629661}
2 files changed