Get iOS GN build working again

ios/web/BUILD.gn

Index: ios/web/BUILD.gn
diff --git a/ios/web/BUILD.gn b/ios/web/BUILD.gn
index 013c02ca459c835b82083bfa8208d9fc3a9afc2b..8623845691d606e53494c568f1e3da8d4279bd0b 100644
--- a/ios/web/BUILD.gn
+++ b/ios/web/BUILD.gn
@@ -343,6 +343,8 @@ source_set("test_support") {
     "public/test/response_providers/file_based_response_provider_impl.mm",
     "public/test/response_providers/response_provider.h",
     "public/test/response_providers/response_provider.mm",
+    "public/test/scoped_Testing_web_client.h",

[sdefresne, 2016/02/22 08:29:29]

nit: the files are named scoped_testing_web_client.{h,mm} (i.e. with a
lower-case 't'). While bots and most of the devs use a case-insensitive file
system (this is the default on HFS+) other do use a case-sensitive one to work
on Chrome. Could you fix in a followup?

[Dirk Pranke, 2016/02/22 16:56:00]

Whoops. Yes of course, that must've been a typo that snuck in on my part :(.

+    "public/test/scoped_Testing_web_client.mm",
     "public/test/test_browser_state.cc",
     "public/test/test_browser_state.h",
     "public/test/test_web_client.h",