mac/gn: Build performance_browser_tests

mac/gn: Build performance_browser_tests

With this, all *tests binaries built in the gyp build are also built
in the gn build on Mac (except remoting).

Also remove an unused js2webui rule in the gyp version of the target:
The target doesn't contain any .js files.

BUG=431177
Committed: https://crrev.com/50bcf83ca74dba33f56ac8678c9359a92528272a
Cr-Commit-Position: refs/heads/master@{#397784}

[Nico, 2016-06-03 16:12:53]

thakis@chromium.org changed reviewers:
+ rsesek@chromium.org

[Robert Sesek, 2016-06-03 17:33:20]

lgtm

[Nico, 2016-06-03 17:48:14]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2016-06-03 17:48:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2035083003/1

[commit-bot: I haz the power, 2016-06-03 20:05:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-03 20:06:51]

Description was changed from

==========
mac/gn: Build performance_browser_tests

With this, all *tests binaries built in the gyp build are also built
in the gn build on Mac (except remoting).

Also remove an unused js2webui rule in the gyp version of the target:
The target doesn't contain any .js files.

BUG=431177
==========

to

==========
mac/gn: Build performance_browser_tests

With this, all *tests binaries built in the gyp build are also built
in the gn build on Mac (except remoting).

Also remove an unused js2webui rule in the gyp version of the target:
The target doesn't contain any .js files.

BUG=431177

Committed: https://crrev.com/50bcf83ca74dba33f56ac8678c9359a92528272a
Cr-Commit-Position: refs/heads/master@{#397784}
==========

[commit-bot: I haz the power, 2016-06-03 20:06:52]

Patchset 1 (id:??) landed as
https://crrev.com/50bcf83ca74dba33f56ac8678c9359a92528272a
Cr-Commit-Position: refs/heads/master@{#397784}