Register a fake Flash with chrome://plugins during browser start-up. This enables websites to query…

Register a fake Flash with chrome://plugins during browser start-up. This enables websites to query for the presence of Flash using navigator.plugins and navigator.mimeTypes even when we don't actually have it.

TEST=https://docs.google.com/a/google.com/document/d/1P0WslUXMUO9azLmWZ0AtQ-sGExWbHttr_2gQWDXf3MY/pub
BUG=641448, 641884, 641657
Review-Url: https://codereview.chromium.org/2284053002
Cr-Commit-Position: refs/heads/master@{#415100}
(cherry picked from commit cd59e9b913623e8fec8bbc9d5517610bc1bfc9a7)

Committed: https://chromium.googlesource.com/chromium/src/+/e450b2360ecde771cdfb67c647fef7523bde435f

[waffles, 2016-09-01 23:15:11]

Description was changed from

==========
Register a fake Flash with chrome://plugins during browser start-up. This
enables websites to query for the presence of Flash using navigator.plugins and
navigator.mimeTypes even when we don't actually have it.

TEST=https://docs.google.com/a/google.com/document/d/1P0WslUXMUO9azLmWZ0AtQ-sGExWbHttr_2gQWDXf3MY/pub
BUG=641448,641884,641657

Review-Url: https://codereview.chromium.org/2284053002
Cr-Commit-Position: refs/heads/master@{#415100}
(cherry picked from commit cd59e9b913623e8fec8bbc9d5517610bc1bfc9a7)
==========

to

==========
Register a fake Flash with chrome://plugins during browser start-up. This
enables websites to query for the presence of Flash using navigator.plugins and
navigator.mimeTypes even when we don't actually have it.

TEST=https://docs.google.com/a/google.com/document/d/1P0WslUXMUO9azLmWZ0AtQ-sGExWbHttr_2gQWDXf3MY/pub
BUG=641448,641884,641657

Review-Url: https://codereview.chromium.org/2284053002
Cr-Commit-Position: refs/heads/master@{#415100}
(cherry picked from commit cd59e9b913623e8fec8bbc9d5517610bc1bfc9a7)

Committed:
https://chromium.googlesource.com/chromium/src/+/e450b2360ecde771cdfb67c647fe...
==========

[waffles, 2016-09-01 23:15:13]

Committed patchset #1 (id:1) manually as
e450b2360ecde771cdfb67c647fef7523bde435f.