Rewrite implementation of ClipboardRecentContent in Objective C.

components/open_from_clipboard/BUILD.gn

Index: components/open_from_clipboard/BUILD.gn
diff --git a/components/open_from_clipboard/BUILD.gn b/components/open_from_clipboard/BUILD.gn
index fe46837a69abecb892c0d7406bb953cc30035c1a..5b31ac109a0e1d4d348ee6a63a9ca2000ba760ed 100644
--- a/components/open_from_clipboard/BUILD.gn
+++ b/components/open_from_clipboard/BUILD.gn
@@ -11,11 +11,29 @@ static_library("open_from_clipboard") {
   ]
 
   deps = [
+    ":open_from_clipboard_impl",
     "//base",
+    "//net",
     "//url",
   ]
 }
 
+# Helper classes used by "open_from_clipboard" target. These classes have
+# no dependencies on "//base:i18n".
+source_set("open_from_clipboard_impl") {
+  sources = [
+    "clipboard_recent_content_impl_ios.h",
+    "clipboard_recent_content_impl_ios.mm",
+  ]
+  deps = [
+    "//base",
+  ]
+  assert_no_deps = [ "//base:i18n" ]
+  if (is_ios) {
+    configs += [ "//build/config/compiler:enable_arc" ]
+  }
+}
+
 static_library("test_support") {
   testonly = true
   sources = [