Update tools/perf to use cloud_storage from catapult.

tools/perf/fetch_benchmark_deps_unittest.py

Index: tools/perf/fetch_benchmark_deps_unittest.py
diff --git a/tools/perf/fetch_benchmark_deps_unittest.py b/tools/perf/fetch_benchmark_deps_unittest.py
index 52baf66c8d495fa1f7ea90e389a3bddc2ff5f81a..2b07d9994adcb7dc78fa9662b924446b4c1d5110 100644
--- a/tools/perf/fetch_benchmark_deps_unittest.py
+++ b/tools/perf/fetch_benchmark_deps_unittest.py
@@ -9,6 +9,7 @@ import StringIO
 
 import mock # pylint: disable=import-error
 
+from core import path_util
 import fetch_benchmark_deps
 
 
@@ -51,7 +52,7 @@ class FetchBenchmarkDepsUnittest(unittest.TestCase):
         mock_get.GetFilesInDirectoryIfChanged.return_value = True
         fetch_benchmark_deps.main(output)
     for f in output.getvalue().splitlines():
-      fullpath = os.path.join(fetch_benchmark_deps.GetChromiumDir(), f)
+      fullpath = os.path.join(path_util.GetChromiumSrcDir(), f)
       sha1path = fullpath + '.sha1'
       self.assertTrue(os.path.isfile(sha1path))
     if expected_fetched_file_paths:
@@ -68,5 +69,5 @@ class FetchBenchmarkDepsUnittest(unittest.TestCase):
     octane_wpr_path = os.path.join(
         os.path.dirname(__file__), 'page_sets', 'data', 'octane_001.wpr')
     expected = os.path.relpath(octane_wpr_path,
-                               fetch_benchmark_deps.GetChromiumDir())
+                               path_util.GetChromiumSrcDir())
     self._RunFetchBenchmarkDepsTest('octane', NormPaths(expected))