Truncate long URL fragments in Android page info popup

Truncate long URL fragments in Android page info popup

This replaces percent-encoding whitespace as a method to combat the use
of crafted URL fragments to inject messages into the page info popup. By
truncating the URL so that at most two lines of the fragment are shown,
we prevent lengthy messages from being injected while minimising the
effect on most URLs.

BUG=466351
Review URL: https://codereview.chromium.org/1077483002

Merged from trunk.
TBR=tedchoc@chromium.org

Cr-Commit-Position: refs/heads/master@{#325358}
(cherry picked from commit 5bf8a2dccf4777c5f065d918d1d9a2bbaa013f9f)

Committed: https://chromium.googlesource.com/chromium/src/+/5aba40cebe8c915c114f3d6ffd10a0c29f0f77d8

[benwells, 2015-04-21 04:00:01]

benwells@chromium.org changed reviewers:
+ tedchoc@chromium.org

[benwells, 2015-04-21 04:02:59]

Committed patchset #1 (id:1) manually as
5aba40cebe8c915c114f3d6ffd10a0c29f0f77d8 (presubmit successful).