Separate RenderViewHost from RenderWidgetHost, part 1: public interface.

This is the first part of the separation of RenderViewHost and RenderWidgetHost. The separation of the Impls is yet to come.

BUG=478281
TEST=all green

Review URL: https://codereview.chromium.org/1392323003

Cr-Commit-Position: refs/heads/master@{#354258}
diff --git a/chrome/browser/memory_details.cc b/chrome/browser/memory_details.cc
index c6a7e7c..c6e057b 100644
--- a/chrome/browser/memory_details.cc
+++ b/chrome/browser/memory_details.cc
@@ -24,6 +24,7 @@
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
+#include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_iterator.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/bindings_policy.h"