Turn on APPCACHE_USE_SIMPLE_CACHE on Android & GN to match GYP

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 233a4303f12ba528ca2c6a1faee2c16eb065261f..f5ce289fcfea0d6eeba43a1f40dbfed0bb991c87 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -496,6 +496,7 @@ group("content_unittests_run") {
 }
 
 test("content_unittests") {
+  defines = []
   sources = rebase_path(content_tests_gypi_values.content_unittests_sources,
                         ".",
                         "//content")
@@ -671,6 +672,8 @@ test("content_unittests") {
     ]
     deps -= [ "//device/battery" ]
     deps += [ "//testing/android/native_test:native_test_native_code" ]
+
+    defines += [ "APPCACHE_USE_SIMPLE_CACHE" ]
   }
   if (!is_android && !is_ios) {
     deps += [ "//third_party/libvpx_new" ]