Remove the mojo_use_application_in_sdk GN variable.

mojo/public/BUILD.gn

Index: mojo/public/BUILD.gn
diff --git a/mojo/public/BUILD.gn b/mojo/public/BUILD.gn
index c7129539c77fbe711354826895b0c11265eac921..2d256e7d8994dab255d29e6f19af949d92ec3fc7 100644
--- a/mojo/public/BUILD.gn
+++ b/mojo/public/BUILD.gn
@@ -10,16 +10,13 @@ group("public") {
   deps = [
     ":libmojo_sdk",
     ":sdk",
+    "cpp/application:standalone",
     "cpp/bindings",
     "cpp/environment:standalone",
     "cpp/utility",
     "interfaces/bindings/tests:test_interfaces",
   ]
 
-  if (mojo_use_application_in_sdk) {
-    deps += [ "cpp/application:standalone" ]
-  }
-
   if (is_linux && !is_fnl) {
     deps += [
       "python",
@@ -29,33 +26,25 @@ group("public") {
 
   if (is_android) {
     deps += [
+      "java:application",
       "java:system",
       "java:bindings",
     ]
   }
-
-  if (is_android && mojo_use_application_in_sdk) {
-    deps += [ "java:application" ]
-  }
 }
 
 group("sdk") {
   deps = [
     "c/system",
+    "cpp/application:standalone",
     "cpp/bindings",
     "cpp/environment:standalone",
     "cpp/utility",
+    "interfaces/application",
     "interfaces/bindings",
     "js",
   ]
 
-  if (mojo_use_application_in_sdk) {
-    deps += [
-      "cpp/application:standalone",
-      "interfaces/application",
-    ]
-  }
-
   if (mojo_use_network_in_sdk) {
     deps += [ "interfaces/network" ]
   }