Remove surface_id from RenderWidget/RenderWidgetHost and friends

We don't need them any more.

BUG=487471

Review URL: https://codereview.chromium.org/1359163005

Cr-Commit-Position: refs/heads/master@{#350686}
diff --git a/content/browser/security_exploit_browsertest.cc b/content/browser/security_exploit_browsertest.cc
index 128ea53..2c5acc4 100644
--- a/content/browser/security_exploit_browsertest.cc
+++ b/content/browser/security_exploit_browsertest.cc
@@ -236,8 +236,7 @@
   // different timing in the test, let's simulate a CreateNewWidget call coming
   // from the IO thread.  Use the existing window routing id to cause a
   // deliberate collision.
-  pending_rvh->CreateNewWidget(duplicate_routing_id, 0 /* surface_id */,
-                               blink::WebPopupTypePage);
+  pending_rvh->CreateNewWidget(duplicate_routing_id, blink::WebPopupTypePage);
 
   // If the above operation doesn't crash, the test has succeeded!
 }