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This CL follows up on the session history changes in
https://chromium-review.googlesource.com/c/chromium/src/+/2181973.
Prior to that CL, inactive frames or frames with no
FrameNavigationEntry returned early from FindFramesToNavigate(),
without recursing down into subframes.  After that CL, we will now
recurse into subframes and keep looking for navigations in those
cases.  This is harmless, since an inactive frame's children should
all be inactive as well, and subframes of a frame with no FNE also
won't have FNEs, but it's also redundant.  This CL modifies the new
flow through DetermineActionForHistoryNavigation() to match the old
behavior and stop looking for navigations in subframes in those cases.

Bug: 705550
Change-Id: Ida707fc9e108f7102b26cf4e44f4d9761e7dd7a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225353
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Auto-Submit: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774702}