Refactor away the Browser* dependency in exclusive_access

chrome/browser/ui/exclusive_access/exclusive_access_context.cc

+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/exclusive_access/exclusive_access_context.h"
+
+#include "base/logging.h"
+
+bool ExclusiveAccessContext::SupportsFullscreenWithToolbar() const {
+  return false;
+}
+
+void ExclusiveAccessContext::UpdateFullscreenWithToolbar(bool with_toolbar) {
+  NOTIMPLEMENTED();
+}
+
+void ExclusiveAccessContext::SetMetroSnapMode(bool enable) {
+  NOTIMPLEMENTED();
+}
+
+bool ExclusiveAccessContext::IsInMetroSnapMode() const {
+  return false;
+}
+
+void ExclusiveAccessContext::UpdateDownloadShelf(bool unhide) {
+  // NOOP implementation.
+}