[Android] Don't build remoting_unittests.

It doesn't build in gyp configurations, either:
https://code.google.com/p/chromium/codesearch#chromium/src/build/all.gyp&l=342

TBR=brettw@chromium.org
BUG=464031

Review URL: https://codereview.chromium.org/979973002

Cr-Commit-Position: refs/heads/master@{#319136}

BUILD.gn

@@ -66,7 +66,6 @@ group("gn_all") {
     "//ppapi:ppapi_unittests",
     "//ppapi/examples",  # TODO(GYP): What's the GYP equivalent?
     "//printing:printing_unittests",
-    "//remoting:remoting_unittests",
     "//skia:skia_unittests",
     "//sql:sql_unittests",
     "//sync:sync_unit_tests",
@@ -101,6 +100,10 @@ group("gn_all") {
     deps += [ "//extensions/shell:app_shell_unittests" ]
   }
 
+  if (!is_android) {
+    deps += [ "//remoting:remoting_unittests" ]
+  }
+
   if (!is_win) {
     deps += [ "//breakpad:symupload" ]
   }