This CL changes the ICU collator being used for text searching in the
PDF viewer from the default to the 'search' one. This is the same
collator used in Blink, and it folds together similar looking
characters in a locale specific way, so that things like accented and
unaccented vowles will match or not match dependent on the
expectations of the user locale.

Additionally, when searching single and double quotation characters
are being simplified to the ASCII forms of them to make matching
between defferent types of quotes work better. Quotation marks are a
known limitation of the search collator and this workaround is based
off a similar solution that exists in Blink to improve matching.

BUG=chromium:142627

Change-Id: I399ea1f0bacb58434b468866127a91ccb6213e99
Reviewed-on: https://chromium-review.googlesource.com/c/1281178
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601157}