[build] And missing DFE input.

Change-Id: I126e115555430b6fe6928f2f32966e772b1fd9df
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449584
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

build/dart/dart_action.gni

@@ -143,6 +143,9 @@ template("_prebuilt_tool_action") {
     if (defined(invoker.packages)) {
       inputs += [ invoker.packages ]
     }
+    if (defined(invoker.dfe)) {
+      inputs += [ invoker.dfe ]
+    }
 
     args = [ "compiled_action" ]
 
@@ -379,7 +382,7 @@ template("dart_action") {
       if (!defined(invoker.deps)) {
         deps = []
       }
-      deps += [ "$_dart_root/utils/kernel-service:kernel-service" ]
+      deps += [ "$_dart_root/utils/kernel-service" ]
     }
   }
 }