[build] Remove unused "exec_script" mode from gn_run_binary.py.

Change-Id: Ie7d184dfe1694985fdff318736f34b45267a5bf3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/509141
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

utils/compile_platform.gni

@@ -68,12 +68,10 @@ template("compile_platform") {
       depfile = outputs[0] + ".d"
 
       script = "$_dart_root/build/gn_run_binary.py"
-      args = [
-        "compiled_action",
-        rebase_path(get_label_info(compile_platform_tool, "root_out_dir") +
-                        "/compile_platform.exe",
-                    root_build_dir),
-      ]
+      args =
+          [ rebase_path(get_label_info(compile_platform_tool, "root_out_dir") +
+                            "/compile_platform.exe",
+                        root_build_dir) ]
       args += invoker.args
       if (defined(invoker.single_root_scheme)) {
         args += [ "--single-root-scheme=" + invoker.single_root_scheme ]

utils/dart2wasm/BUILD.gn

@@ -11,7 +11,6 @@ template("wasm_module") {
   action(target_name) {
     script = rebase_path("//build/gn_run_binary.py")
     args = [
-      "compiled_action",
       rebase_path("//third_party/emsdk/upstream/emscripten/emcc"),
       "--no-entry",
       rebase_path("//tests/web/wasm/ffi/${invoker.module_name}.c"),

utils/kernel-service/BUILD.gn

@@ -112,12 +112,9 @@ template("kernel_service_dill") {
       scheme = "org-dartlang-kernel-service"
 
       script = "$_dart_root/build/gn_run_binary.py"
-      args = [
-        "compiled_action",
-        rebase_path(
-            get_label_info(gen_kernel_tool, "root_out_dir") + "/gen_kernel.exe",
-            root_build_dir),
-      ]
+      args = [ rebase_path(get_label_info(gen_kernel_tool, "root_out_dir") +
+                               "/gen_kernel.exe",
+                           root_build_dir) ]
       args += invoker.extra_args
       args += [
         "--depfile=" + rebase_path(depfile, root_build_dir),