Prototype of HttpProtocolHandler perf test with ARC.

components/cronet/ios/BUILD.gn

Index: components/cronet/ios/BUILD.gn
diff --git a/components/cronet/ios/BUILD.gn b/components/cronet/ios/BUILD.gn
index ac1dfe0620298748e245c9330e3e21cebd106045..aad1f5354564d95dac30794d203902072d875658 100644
--- a/components/cronet/ios/BUILD.gn
+++ b/components/cronet/ios/BUILD.gn
@@ -64,6 +64,8 @@ source_set("cronet_sources") {
   if (!use_platform_icu_alternatives) {
     deps += [ "//base:i18n" ]
   }
+
+  configs += [ "//build/config/compiler:enable_arc" ]
 }
 
 # Tweak |info_plist| with current version and revision.
@@ -101,6 +103,7 @@ ios_framework_bundle("cronet_framework") {
 
   configs -= [ "//build/config/compiler:default_symbols" ]
   configs += [ "//build/config/compiler:symbols" ]
+  configs += [ "//build/config/compiler:enable_arc" ]
 }
 
 test("cronet_unittests") {