[telemetry] Sort imports in Telemetry and its dependents.

tools/telemetry/telemetry/core/backends/browser_backend.py

Index: tools/telemetry/telemetry/core/backends/browser_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/browser_backend.py b/tools/telemetry/telemetry/core/backends/browser_backend.py
index 0f95f780935d0926e584f95aa66279b028bcdc14..e28bbe4b2ebc1c695aab073080add017a1f8cb4b 100644
--- a/tools/telemetry/telemetry/core/backends/browser_backend.py
+++ b/tools/telemetry/telemetry/core/backends/browser_backend.py
@@ -2,11 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from telemetry import decorators
-from telemetry.core import platform
-from telemetry.core import web_contents
 from telemetry.core.backends import app_backend
+from telemetry.core import platform
 from telemetry.core.platform import profiling_controller_backend
+from telemetry.core import web_contents
+from telemetry import decorators
 
 
 class ExtensionsNotSupportedException(Exception):