[MediaRouter] The minimal change to make everything build on Android.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 27be332c0b62f2735e198c75e6958a38017d2d49..a199ce7d0a29389229401ca15db38f1fbb7b58c7 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1455,6 +1455,12 @@ if (!is_android) {
               ".",
               "//chrome")
       deps += [ "//chrome/browser/media/router:test_support" ]
+      if (!is_android) {
+        sources += rebase_path(
+                chrome_tests_unit_gypi_values.chrome_unit_tests_media_router_non_android_sources,
+                ".",
+                "//chrome")
+      }
       if (!toolkit_views) {
         sources -= [ "../browser/ui/views/media_router/media_router_ui_browsertest.cc" ]
       }