Remove unit_test_run target from Swarm

The swarm slaves seem to be missing some required files for unit test, removing unit test target until the machines can be adjusted to have the required files.

R=maruel@chromium.org
BUG=
TEST=Swarm Bots compile again


Review URL: http://codereview.chromium.org/10377012

git-svn-id: http://src.chromium.org/svn/trunk/src/build@135423 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -165,7 +165,6 @@
       'dependencies': [
           '../base/base.gyp:base_unittests_run',
           '../net/net.gyp:net_unittests_run',
-          '../chrome/chrome.gyp:unit_tests_run'
       ],
     }, # target_name: chromium_swarm_tests
     {