[Telemetry] Change the way host port for android_browser_backend is created

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

Index: tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
diff --git a/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py b/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
index f9ea8c4fb5a495fe74bebfc385d9c7fee7b2f48d..37874d484c44982d6ded459f255c6e9d27b092ab 100644
--- a/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
+++ b/tools/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py
@@ -15,10 +15,6 @@ from telemetry.internal.backends.chrome import chrome_browser_backend
 from telemetry.internal import forwarders
 
 util.AddDirToPythonPath(util.GetChromiumSrcDir(), 'build', 'android')
-try:
-  from pylib import ports
-except ImportError:
-  ports = None
 from pylib.device import intent
 
 
@@ -46,7 +42,7 @@ class AndroidBrowserBackend(chrome_browser_backend.ChromeBrowserBackend):
 
     # TODO(tonyg): This is flaky because it doesn't reserve the port that it
     # allocates. Need to fix this.
-    self._port = ports.AllocateTestServerPort()
+    self._port = util.GetUnreservedAvailableLocalPort()
 
     # TODO(wuhu): Move to network controller backend.
     self.platform_backend.InstallTestCa()