Separate mojo/shell into a runner and the application manager (shell)

mojo/shell/test/BUILD.gn

Index: mojo/shell/test/BUILD.gn
diff --git a/mojo/shell/test/BUILD.gn b/mojo/shell/test/BUILD.gn
deleted file mode 100644
index 7ca52ff8dd6824a2724fabe8e61bc9eb2d153ab3..0000000000000000000000000000000000000000
--- a/mojo/shell/test/BUILD.gn
+++ /dev/null
@@ -1,28 +0,0 @@
-import("//third_party/mojo/src/mojo/public/mojo.gni")
-import("//third_party/mojo/src/mojo/public/mojo_application.gni")
-import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
-import("//testing/test.gni")
-
-mojom("bindings") {
-  sources = [
-    "pingable.mojom",
-  ]
-}
-
-mojo_native_application("pingable_app") {
-  output_name = "pingable_app"
-
-  testonly = true
-
-  sources = [
-    "pingable_app.cc",
-  ]
-
-  deps = [
-    ":bindings",
-    "//third_party/mojo/src/mojo/public/cpp/application:standalone",
-    "//third_party/mojo/src/mojo/public/cpp/bindings:callback",
-    "//third_party/mojo/src/mojo/public/cpp/environment",
-    "//third_party/mojo/src/mojo/public/cpp/system",
-  ]
-}