Remove some pass-thrus on RootWindow API in favor of exposing the RootWindowHost again.

chrome/browser/ui/aura/tabs/dock_info_auralinux.cc

Index: chrome/browser/ui/aura/tabs/dock_info_auralinux.cc
diff --git a/chrome/browser/ui/aura/tabs/dock_info_auralinux.cc b/chrome/browser/ui/aura/tabs/dock_info_auralinux.cc
index c26d04622178d1bc1e46e88a67bbb1d6a9256b1b..47dce8cf1212d53cd69903ce8ffa680e9a992da3 100644
--- a/chrome/browser/ui/aura/tabs/dock_info_auralinux.cc
+++ b/chrome/browser/ui/aura/tabs/dock_info_auralinux.cc
@@ -27,7 +27,7 @@ class BaseWindowFinder : public ui::EnumerateWindowsDelegate {
   explicit BaseWindowFinder(const std::set<aura::Window*>& ignore) {
     std::set<aura::Window*>::iterator iter;
     for (iter = ignore.begin(); iter != ignore.end(); iter++) {
-      XID xid = (*iter)->GetDispatcher()->GetAcceleratedWidget();
+      XID xid = (*iter)->GetDispatcher()->host()->GetAcceleratedWidget();
       ignore_.insert(xid);
     }
   }