Move navigation and frame tree classes to a new frame_host/ directory.

content/browser/renderer_host/DEPS

Index: content/browser/renderer_host/DEPS
diff --git a/content/browser/renderer_host/DEPS b/content/browser/renderer_host/DEPS
index a0f0ecfa5a4287e7c7391b07c96ad5ed634ed81f..7fce152d79b100f98f867bc0f50a4424f8cf2071 100644
--- a/content/browser/renderer_host/DEPS
+++ b/content/browser/renderer_host/DEPS
@@ -7,6 +7,7 @@ include_rules = [
 
   # The renderer_host files should only call upwards in the layering via the
   # delegate interfaces.
+  "-content/browser/frame_host",
   "-content/browser/web_contents",
   "-content/public/browser/web_contents.h",
   "-content/public/browser/web_contents_delegate.h",
@@ -15,6 +16,7 @@ include_rules = [
 
 specific_include_rules = {
   ".*_(unit|browser)test\.cc": [
+    "+content/browser/frame_host",
     "+content/browser/web_contents",
     "+content/public/browser/web_contents.h",
     "+content/public/browser/web_contents_view.h",
@@ -24,4 +26,13 @@ specific_include_rules = {
     "+third_party/WebKit/public/web/WebKit.h",
     "+third_party/WebKit/public/web/linux/WebFontInfo.h",
   ],
+  "render_process_host_impl\.cc": [
+    "+content/browser/frame_host/render_frame_message_filter.h",
+  ],
+  # TODO(nasko): Remove these exceptions once we've untangled the dependency
+  # of RenderViewHost on the FrameTree.
+  "render_view_host_impl\.(cc|h)": [
+    "+content/browser/frame_host/frame_tree.h",
+    "+content/browser/frame_host/render_frame_host_impl.h",
+  ],
 }