[omnibox chrome:omnibox] Remove need for 'shift' key from accesskeys.

1) 'Show all details' accesskey changed from 'd' to 't' as both 'd' and 'e' are
reserved by the browser.
2) Filter text input accesskye changed from 'f' to 'g'.

Accordingly, the accesskey hint in the placholder texts of text inputs are
changed to no longer include 'shift'.

Bug: 891303
Change-Id: I67003c7978e68a01bad3bdf6816bbba932167c43
Reviewed-on: https://chromium-review.googlesource.com/c/1381135
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617570}
1 file changed