Unexport resource_controller.h

This is a follow up for https://codereview.chromium.org/2535723005/
suggested by mmenke@.

ResourceController is no longer used by any file outside of
content/browser/. Move it to content/browser/loader/.

BUG=646277
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2554273002
Cr-Commit-Position: refs/heads/master@{#436967}
diff --git a/content/browser/loader/intercepting_resource_handler.h b/content/browser/loader/intercepting_resource_handler.h
index 3c796a40..f0a6082 100644
--- a/content/browser/loader/intercepting_resource_handler.h
+++ b/content/browser/loader/intercepting_resource_handler.h
@@ -12,9 +12,9 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/loader/layered_resource_handler.h"
+#include "content/browser/loader/resource_controller.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/common/content_export.h"
-#include "content/public/browser/resource_controller.h"
 #include "net/base/io_buffer.h"
 #include "net/url_request/url_request_status.h"