Avoid using ContentBrowserClient::IsIllegalOrigin in ResourceDispatcherHost.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index a8b4b5d0fe2802576945f1909bd4f52718e6c375..f28c62cee74fbc16e5030bf10d21bf8c3d30ee79 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -153,6 +153,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/resource_context.h"
+#include "content/public/browser/resource_dispatcher_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/vpn_service_proxy.h"
@@ -2294,6 +2295,11 @@ bool ChromeContentBrowserClient::CanCreateWindow(
 
 void ChromeContentBrowserClient::ResourceDispatcherHostCreated() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
+#if defined(ENABLE_EXTENSIONS)
+  DCHECK(content::ResourceDispatcherHost::Get());

[jam, 2016/08/01 20:06:01]

nit: not needed by definition. if somehow someone tried to change this to call
this method before RDH was created, there would be a crash which is just as
useful of a signal

[ananta, 2016/08/02 00:40:49]

Done.

+  content::ResourceDispatcherHost::Get()->AddSchemeForAccessCheck(
+      extensions::kExtensionScheme);

[jam, 2016/08/01 20:06:01]

The rest of the RDH initialization on the chrome side is in
BrowserProcessImpl::ResourceDispatcherHostCreated, so probably best to keep this
there with them

[ananta, 2016/08/02 00:40:49]

Done.

+#endif
   return g_browser_process->ResourceDispatcherHostCreated();
 }