[Android] Set enable_remoting=true by default

We set enable_remoting=true in the command line on the official builders. Set
enable_remoting=true as the default on Chromium as well.

BUG=544298

Review URL: https://codereview.chromium.org/1619913002

Cr-Commit-Position: refs/heads/master@{#371604}

build/config/features.gni

@@ -75,7 +75,7 @@ declare_args() {
 
   enable_one_click_signin = is_win || is_mac || (is_linux && !is_chromeos)
 
-  enable_remoting = !is_ios && !is_android && !is_chromecast && !is_headless
+  enable_remoting = !is_ios && !is_chromecast && !is_headless
 
   # Enable hole punching for the protected video.
   enable_video_hole = is_android