Revert of [Telemetry] Refactor Chrome devtools tracing

tools/telemetry/telemetry/internal/platform/tracing_agent/chrome_tracing_devtools_manager.py

Index: tools/telemetry/telemetry/internal/platform/tracing_agent/chrome_tracing_devtools_manager.py
diff --git a/tools/telemetry/telemetry/internal/platform/tracing_agent/chrome_tracing_devtools_manager.py b/tools/telemetry/telemetry/internal/platform/tracing_agent/chrome_tracing_devtools_manager.py
deleted file mode 100644
index de51ea6a1ae4a61fa01dc5a6ae2766be706c8835..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/internal/platform/tracing_agent/chrome_tracing_devtools_manager.py
+++ /dev/null
@@ -1,67 +0,0 @@
-# Copyright 2015 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-class RegisterDevToolsClientError(Exception):
-  pass
-
-
-# A singleton map from platform backends to maps of uniquely-identifying
-# remote port (which may be the same as local port) to DevToolsClientBackend.
-# There is no guarantee that the devtools agent is still alive.
-_platform_backends_to_devtools_clients_maps = {}
-
-
-def _RemoveStaleDevToolsClient(platform_backend):
-  """Removes DevTools clients that are no longer connectable."""
-  devtools_clients_map = _platform_backends_to_devtools_clients_maps.get(
-      platform_backend, {})
-  devtools_clients_map = {
-      port: client
-      for port, client in devtools_clients_map.iteritems()
-      if client.IsAlive()
-      }
-  _platform_backends_to_devtools_clients_maps[platform_backend] = (
-      devtools_clients_map)
-
-
-def RegisterDevToolsClient(devtools_client_backend, platform_backend):
-  """Register DevTools client
-
-  This should only be called from DevToolsClientBackend when it is initialized.
-  """
-  if platform_backend.tracing_controller_backend.is_tracing_running:
-    raise RegisterDevToolsClientError(
-        'Cannot add new DevTools client when tracing is running on '
-        'platform backend %s.' % platform_backend)
-
-  remote_port = str(devtools_client_backend.remote_port)
-  if platform_backend not in _platform_backends_to_devtools_clients_maps:
-    _platform_backends_to_devtools_clients_maps[platform_backend] = {}
-  devtools_clients_map = (
-    _platform_backends_to_devtools_clients_maps[platform_backend])
-  devtools_clients_map[remote_port] = devtools_client_backend
-
-
-def IsSupported(platform_backend):
-  _RemoveStaleDevToolsClient(platform_backend)
-  devtools_clients_map = _platform_backends_to_devtools_clients_maps.get(
-      platform_backend, {})
-  for _, devtools_client in devtools_clients_map.iteritems():
-    if devtools_client.IsChromeTracingSupported():
-      return True
-  return False
-
-
-def GetDevToolsClients(platform_backend):
-  """Get DevTools clients including the ones that are no longer connectable."""
-  devtools_clients_map = _platform_backends_to_devtools_clients_maps.get(
-      platform_backend, {})
-  if not devtools_clients_map:
-    return []
-  return devtools_clients_map.values()
-
-def GetActiveDevToolsClients(platform_backend):
-  """Get DevTools clients that are still connectable."""
-  _RemoveStaleDevToolsClient(platform_backend)
-  return GetDevToolsClients(platform_backend)