Sort out build dependencies for LinuxUI.

ui/linux_ui/linux_ui.cc

Index: ui/linux_ui/linux_ui.cc
diff --git a/ui/base/linux_ui.cc b/ui/linux_ui/linux_ui.cc
similarity index 76%
rename from ui/base/linux_ui.cc
rename to ui/linux_ui/linux_ui.cc
index 0f9ed4cf5ccc0e10aaf756f1e0e83df28e67a368..40ead2fc9fa32ecabd1c07f88c762a1bc5ce5a0b 100644
--- a/ui/base/linux_ui.cc
+++ b/ui/linux_ui/linux_ui.cc
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/base/linux_ui.h"
+#include "ui/linux_ui/linux_ui.h"
+
+#include "ui/shell_dialogs/linux_shell_dialog.h"
 
 namespace {
 
@@ -15,6 +17,8 @@ namespace ui {
 void LinuxUI::SetInstance(LinuxUI* instance) {
   delete g_linux_ui;
   g_linux_ui = instance;
+
+  LinuxShellDialog::SetInstance(instance);
 }
 
 const LinuxUI* LinuxUI::instance() {