Do not reduce the number of layout_test workers in *SAN builds.

This is a partial revert of r184607. Turns out reducing the number of workers
was not the right solution for our performance issues.

BUG=427569
R=dpranke@chromium.org
NOTRY=true
TEST=test-webkitpy

Review URL: https://codereview.chromium.org/722193002

git-svn-id: svn://svn.chromium.org/blink/trunk@185303 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base.py

@@ -270,10 +270,6 @@ class Port(object):
 
     def default_child_processes(self):
         """Return the number of drivers to use for this port."""
-        if self.get_option('enable_sanitizer'):
-            # ASAN/MSAN/TSAN are more cpu- and memory- intensive than regular
-            # content_shell, and so we need to run fewer of them in parallel.
-            return max(int(self._executive.cpu_count() * 0.75), 1)
         return self._executive.cpu_count()
 
     def default_max_locked_shards(self):

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/port_testcase.py

@@ -145,12 +145,6 @@ class PortTestCase(unittest.TestCase):
         num_workers = port.default_child_processes()
         self.assertGreaterEqual(num_workers, 1)
 
-        # Test that we reduce the number of workers for sanitizer builds.
-        port._options.enable_sanitizer = True
-        port.host.executive.cpu_count = lambda: 8
-        num_sanitized_workers = port.default_child_processes()
-        self.assertLess(num_sanitized_workers, 8)
-
     def test_default_max_locked_shards(self):
         port = self.make_port()
         port.default_child_processes = lambda: 16