🚀 Geneate base_unittest's Android .isolate file at build-time

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index cfe258bae5d2e56972efc4e78f3f57cb6e46eb18..b317ceb0c79a889e8740f0c93f7fa4293764a9e9 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -1884,6 +1884,7 @@ test("base_unittests") {
   # Some unittests depend on the ALLOCATOR_SHIM macro.
   configs += [ "//base/allocator:allocator_shim_define" ]
 
+  requires_apk_isolate = is_android
   data = [
     "test/data/",
   ]
@@ -1900,10 +1901,6 @@ test("base_unittests") {
       ":base_java_unittest_support",
       "//base/android/jni_generator:jni_generator_tests",
     ]
-
-    # TODO(brettw) I think this should not be here, we should not be using
-    # isolate files.
-    isolate_file = "base_unittests.isolate"
   }
 
   if (is_ios) {