[ARC] Converts part of ios/web/public to ARC.

ios/web/BUILD.gn

Index: ios/web/BUILD.gn
diff --git a/ios/web/BUILD.gn b/ios/web/BUILD.gn
index 7583843eba609541d3793aa2b1002d8ff8811b99..77b52c39f797e7ef6aacadc9fd1e32b906962628 100644
--- a/ios/web/BUILD.gn
+++ b/ios/web/BUILD.gn
@@ -90,6 +90,20 @@ source_set("web_arc") {
     "net/request_tracker_impl.mm",
     "net/web_http_protocol_handler_delegate.h",
     "net/web_http_protocol_handler_delegate.mm",
+    "payments/payment_request.cc",
+    "public/active_state_manager.h",
+    "public/block_types.h",
+    "public/browser_state.h",
+    "public/browser_url_rewriter.h",
+    "public/cert_policy.h",
+    "public/certificate_policy_cache.h",
+    "public/favicon_status.cc",
+    "public/favicon_status.h",
+    "public/favicon_url.cc",
+    "public/favicon_url.h",
+    "public/interstitials/web_interstitial.h",
+    "public/interstitials/web_interstitial_delegate.h",
+    "public/java_script_dialog_callback.h",
     "string_util.cc",
     "url_scheme_util.mm",
     "url_util.cc",
@@ -155,20 +169,6 @@ source_set("web") {
   ]
 
   sources = [
-    "payments/payment_request.cc",
-    "public/active_state_manager.h",
-    "public/block_types.h",
-    "public/browser_state.h",
-    "public/browser_url_rewriter.h",
-    "public/cert_policy.h",
-    "public/certificate_policy_cache.h",
-    "public/favicon_status.cc",
-    "public/favicon_status.h",
-    "public/favicon_url.cc",
-    "public/favicon_url.h",
-    "public/interstitials/web_interstitial.h",
-    "public/interstitials/web_interstitial_delegate.h",
-    "public/java_script_dialog_callback.h",
     "public/java_script_dialog_presenter.h",
     "public/java_script_dialog_type.h",
     "public/load_committed_details.h",