Disallow was_within_same_page = true for a cross-process navigation.

BUG=590284
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review URL: https://codereview.chromium.org/1738233002

Cr-Commit-Position: refs/heads/master@{#378461}
(cherry picked from commit 8be1ff11dc1fae61146dbcfaa38e12314d290dca)

Review URL: https://codereview.chromium.org/1811783002 .

Cr-Commit-Position: refs/branch-heads/2623@{#629}
Cr-Branched-From: 92d77538a86529ca35f9220bd3cd512cbea1f086-refs/heads/master@{#369907}
3 files changed