Fix for moving to previous url from PDF page in OOP case.

Fix for moving to previous url from PDF page in OOP case.

alt,shift,ctrl are not considered while handling left or right arrow
key in OOP case in PDF.
Check added so that when left/right arrow key is selected then navigation
with in the page will happen when alt,ctrl,shift are not selected.
else default handling happen.

BUG=446162
Committed: https://crrev.com/f58a0ec56b77d86d206cd703efee94a7c6513aab
Cr-Commit-Position: refs/heads/master@{#310045}

[Deepak, 2015-01-05 13:15:04]

deepak.m1@samsung.com changed reviewers:
+ gene@chromium.org, raymes@chromium.org

[Deepak, 2015-01-05 13:15:04]

OOP case issue, we have fixed this issue in in process case earlier.
PTAL

[raymes, 2015-01-05 22:51:05]

lgtm

[Deepak, 2015-01-06 02:43:16]

The CQ bit was checked by deepak.m1@samsung.com

[commit-bot: I haz the power, 2015-01-06 02:43:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/830853003/1

[commit-bot: I haz the power, 2015-01-06 03:52:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-06 03:54:15]

Patchset 1 (id:??) landed as
https://crrev.com/f58a0ec56b77d86d206cd703efee94a7c6513aab
Cr-Commit-Position: refs/heads/master@{#310045}