Remove is_win/OS_WIN checks in shell code

shell/BUILD.gn

Index: shell/BUILD.gn
diff --git a/shell/BUILD.gn b/shell/BUILD.gn
index e83e9e4bc4ecc0a1cf37ce3e982fb73ce9d92222..a66f9f4a56c98a07a2d8d94e828245cfcfe89c8d 100644
--- a/shell/BUILD.gn
+++ b/shell/BUILD.gn
@@ -17,14 +17,11 @@ group("shell") {
   testonly = true
 
   deps = [
+    ":mojo_launcher",
     ":mojo_shell",
     ":tests",
   ]
 
-  if (!is_win) {
-    deps += [ ":mojo_launcher" ]
-  }
-
   if (is_android) {
     deps += [
       ":mojo_shell_apk",
@@ -195,10 +192,6 @@ source_set("lib") {
     ":switches",
   ]
 
-  if (is_win) {
-    deps -= [ "//shell/domain_socket" ]
-  }
-
   if (is_android) {
     sources += [
       "android/android_handler.cc",
@@ -408,10 +401,6 @@ source_set("external_application_registrar_connection") {
     "//shell/domain_socket",
     "//url",
   ]
-
-  if (is_win) {
-    deps -= [ "//shell/domain_socket" ]
-  }
 }
 
 # GYP version: mojo/mojo.gyp:mojo_shell_tests
@@ -505,21 +494,6 @@ test("external_application_unittests") {
     "//shell/domain_socket",
     "//shell/domain_socket:tests",
   ]
-
-  if (is_win) {
-    sources -= [
-      "external_application_listener_unittest.cc",
-      "incoming_connection_listener_unittest.cc",
-    ]
-
-    deps -= [
-      ":lib",
-      ":external_application_registrar_connection",
-      ":external_application_registrar_bindings",
-      "//shell/domain_socket",
-      "//shell/domain_socket:tests",
-    ]
-  }
 }
 
 embed_file("embed_pingable") {