tools/gn: remove three unused functions from string_utils.h

tools/gn: remove three unused functions from string_utils.h

git grep shows these functions have no callers anymore.

BUG=None
TEST=gn gen + gn_unittests
R=scottmg@chromium.org

Committed: https://crrev.com/0814cd9120dc3b96cc99a430188f4e3c0d2e2201
Cr-Commit-Position: refs/heads/master@{#362516}

[tfarina, 2015-12-01 19:53:44]

PTAL.

https://codereview.chromium.org/1483343004/diff/1/tools/gn/string_utils.h
File tools/gn/string_utils.h (left):

https://codereview.chromium.org/1483343004/diff/1/tools/gn/string_utils.h#old...
tools/gn/string_utils.h:42: std::string RemovePrefix(const std::string& str,
const std::string& prefix);
I found this because I was interested on RemovePrefix and went to look for its
usage and to my surprise discovered there was no more usages :)

[scottmg, 2015-12-01 20:31:47]

lgtm

[tfarina, 2015-12-01 21:33:20]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-12-01 21:35:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1483343004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1483343004/1

[commit-bot: I haz the power, 2015-12-01 22:01:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-01 22:02:00]

Description was changed from

==========
tools/gn: remove three unused functions from string_utils.h

git grep shows these functions have no callers anymore.

BUG=None
TEST=gn gen + gn_unittests
R=scottmg@chromium.org
==========

to

==========
tools/gn: remove three unused functions from string_utils.h

git grep shows these functions have no callers anymore.

BUG=None
TEST=gn gen + gn_unittests
R=scottmg@chromium.org

Committed: https://crrev.com/0814cd9120dc3b96cc99a430188f4e3c0d2e2201
Cr-Commit-Position: refs/heads/master@{#362516}
==========

[commit-bot: I haz the power, 2015-12-01 22:02:00]

Patchset 1 (id:??) landed as
https://crrev.com/0814cd9120dc3b96cc99a430188f4e3c0d2e2201
Cr-Commit-Position: refs/heads/master@{#362516}