[Chromecast] Remove default kNoWifi flag for Android builds

This already isn't necessary on Android TV builds based on where the
flag is used, and we don't want this default for Android Things builds.

BUG=internal b/62633642
TEST=Builds.

Change-Id: Ie571a5d9ef3a7f8f08ac71346165d828c734e848
Reviewed-on: https://chromium-review.googlesource.com/541864Reviewed-by: Alok Priyadarshi <alokp@chromium.org>
Commit-Queue: Bryan Henry <bryanhenry@google.com>
Cr-Commit-Position: refs/heads/master@{#481693}

chromecast/browser/cast_browser_main_parts.cc

@@ -218,10 +218,6 @@ struct DefaultCommandLineSwitch {
 
 DefaultCommandLineSwitch g_default_switches[] = {
 #if defined(OS_ANDROID)
-#if !BUILDFLAG(IS_CAST_AUDIO_ONLY)
-    // Disables Chromecast-specific WiFi-related features on ATV for now.
-    {switches::kNoWifi, ""},
-#endif  // !BUILDFLAG(IS_CAST_AUDIO_ONLY)
     // TODO(714676): this should probably set the no restrictions autoplay
     // policy instead.
     {switches::kIgnoreAutoplayRestrictionsForTests, ""},