Fix layering violation in content\browser\renderer_host. That directory shouldn't be including web_…

content/browser/renderer_host/DEPS

Index: content/browser/renderer_host/DEPS
===================================================================
--- content/browser/renderer_host/DEPS	(revision 184684)
+++ content/browser/renderer_host/DEPS	(working copy)
@@ -8,5 +8,11 @@
 
   # The renderer_host files should only call upwards in the layering via the
   # delegate interfaces.
-  "-content/browser/tab_contents",
+  "-content/browser/web_contents",
 ]
+
+specific_include_rules = {
+  ".*_(unit|browser|api)test\.cc": [
+    "+content/browser/web_contents",
+  ],
+}