Disable casting warning from cpplint in chromium

This warning is incorrect when cpplint is run on Objective-C headers.

This CL also adds an explicit "verbose" config, which shouldn't
change behavior, but explicit is better than implicit.

Bug: 924509
Change-Id: I39f35926ae799fc1c03947a2320590932757d4bc
Reviewed-on: https://chromium-review.googlesource.com/c/1431892Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625439}

infra/config/global/tricium-prod.cfg

@@ -11,7 +11,11 @@ selections {
   platform: UBUNTU
   configs {
     name: "filter"
-    value: "-,+readability/todo,+readability/check,+readability/casting,+readability/fn_size,+build/include_what_you_use,+build/include_order"
+    value: "-,+readability/todo,+readability/check,+readability/fn_size,+build/include_what_you_use,+build/include_order"
+  }
+  configs {
+    name: "verbose"
+    value: "4"
   }
 }