[Telemetry] Move WPR life cycle from browser to platform

tools/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py

Index: tools/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py
diff --git a/tools/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py b/tools/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py
index 845f84939b8d52e19551acf68f7ee1712e2284f0..8397d31ff320f9f84def3b191975eb8dddcb3d33 100644
--- a/tools/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py
+++ b/tools/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py
@@ -17,7 +17,6 @@ from telemetry.internal.backends.chrome import tab_list_backend
 from telemetry.internal.backends.chrome_inspector import devtools_client_backend
 from telemetry.internal.browser import user_agent
 from telemetry.internal.browser import web_contents
-from telemetry.internal import forwarders
 from telemetry.testing import options_for_unittests
 from telemetry.util import wpr_modes
 
@@ -44,17 +43,6 @@ class ChromeBrowserBackend(browser_backend.BrowserBackend):
     self._output_profile_path = output_profile_path
     self._extensions_to_load = extensions_to_load
 
-    if browser_options.netsim:
-      self.wpr_port_pairs = forwarders.PortPairs(
-          http=forwarders.PortPair(80, 80),
-          https=forwarders.PortPair(443, 443),
-          dns=forwarders.PortPair(53, 53))
-    else:
-      self.wpr_port_pairs = forwarders.PortPairs(
-          http=forwarders.PortPair(0, 0),
-          https=forwarders.PortPair(0, 0),
-          dns=None)
-
     if (self.browser_options.dont_override_profile and
         not options_for_unittests.AreSet()):
       sys.stderr.write('Warning: Not overriding profile. This can cause '
@@ -150,7 +138,8 @@ class ChromeBrowserBackend(browser_backend.BrowserBackend):
     return True
 
   def GetReplayBrowserStartupArgs(self):
-    if self.browser_options.wpr_mode == wpr_modes.WPR_OFF:
+    network_backend = self.platform_backend.network_controller_backend
+    if network_backend.wpr_mode == wpr_modes.WPR_OFF:
       return []
     replay_args = []
     if self.should_ignore_certificate_errors:
@@ -160,11 +149,10 @@ class ChromeBrowserBackend(browser_backend.BrowserBackend):
     if self._UseHostResolverRules():
       # Force hostnames to resolve to the replay's host_ip.
       replay_args.append('--host-resolver-rules=MAP * %s,EXCLUDE localhost' %
-                         self._platform_backend.forwarder_factory.host_ip)
+                         network_backend.host_ip)
     # Force the browser to send HTTP/HTTPS requests to fixed ports if they
     # are not the standard HTTP/HTTPS ports.
-    http_port = self.platform_backend.wpr_http_device_port
-    https_port = self.platform_backend.wpr_https_device_port
+    http_port, https_port, _ = network_backend.wpr_device_ports
     if http_port != 80:
       replay_args.append('--testing-fixed-http-port=%s' % http_port)
     if https_port != 443: