Use standardized accelerator-to-shortcut code for new backspace shortcut UI.

Use standardized accelerator-to-shortcut code for new backspace shortcut UI.

This changes the left and right arrow symbols into text (e.g. "left arrow"),
reducing ambiguity.  It also promotes cmd-[ over cmd-left on Mac.

BUG=637547
TEST=On a new profile, have a page in your "back" session history, then hit backspace twice while outside a textfield to trigger the "Use alt-left to go back" UI.  It should say "Left arrow" instead of "<-".

Review-Url: https://codereview.chromium.org/2540523003
Cr-Commit-Position: refs/heads/master@{#439747}
(cherry picked from commit 00d3a368e97975b82f4dc4f483f6e8c6e85331c0)

Committed: https://chromium.googlesource.com/chromium/src/+/7f18e530baf0f121b54634b39ddec536715a8a79

[Peter Kasting, 2016-12-22 00:48:12]

Description was changed from

==========
Use standardized accelerator-to-shortcut code for new backspace shortcut UI.

This changes the left and right arrow symbols into text (e.g. "left arrow"),
reducing ambiguity.  It also promotes cmd-[ over cmd-left on Mac.

BUG=637547
TEST=On a new profile, have a page in your "back" session history, then hit
backspace twice while outside a textfield to trigger the "Use alt-left to go
back" UI.  It should say "Left arrow" instead of "<-".

Review-Url: https://codereview.chromium.org/2540523003
Cr-Commit-Position: refs/heads/master@{#439747}
(cherry picked from commit 00d3a368e97975b82f4dc4f483f6e8c6e85331c0)
==========

to

==========
Use standardized accelerator-to-shortcut code for new backspace shortcut UI.

This changes the left and right arrow symbols into text (e.g. "left arrow"),
reducing ambiguity.  It also promotes cmd-[ over cmd-left on Mac.

BUG=637547
TEST=On a new profile, have a page in your "back" session history, then hit
backspace twice while outside a textfield to trigger the "Use alt-left to go
back" UI.  It should say "Left arrow" instead of "<-".

Review-Url: https://codereview.chromium.org/2540523003
Cr-Commit-Position: refs/heads/master@{#439747}
(cherry picked from commit 00d3a368e97975b82f4dc4f483f6e8c6e85331c0)

Committed:
https://chromium.googlesource.com/chromium/src/+/7f18e530baf0f121b54634b39dde...
==========

[Peter Kasting, 2016-12-22 00:48:13]

Committed patchset #1 (id:1) manually as
7f18e530baf0f121b54634b39ddec536715a8a79.