[telemetry] Sort imports in Telemetry and its dependents.

tools/telemetry/telemetry/core/browser_unittest.py

Index: tools/telemetry/telemetry/core/browser_unittest.py
diff --git a/tools/telemetry/telemetry/core/browser_unittest.py b/tools/telemetry/telemetry/core/browser_unittest.py
index 8e23c2317b8ee15a5a43d2555decb652cbb814c3..685dd2669400211e65284061d3ceb2b043af3064 100644
--- a/tools/telemetry/telemetry/core/browser_unittest.py
+++ b/tools/telemetry/telemetry/core/browser_unittest.py
@@ -8,14 +8,14 @@ import shutil
 import tempfile
 import unittest
 
-from telemetry import decorators
 from telemetry.core import browser_finder
 from telemetry.core import gpu_device
 from telemetry.core import gpu_info
-from telemetry.core import system_info
-from telemetry.core import util
 from telemetry.core.platform import tracing_category_filter
 from telemetry.core.platform import tracing_options
+from telemetry.core import system_info
+from telemetry.core import util
+from telemetry import decorators
 from telemetry.unittest_util import browser_test_case
 from telemetry.unittest_util import options_for_unittests
 from telemetry.util import path