Stop using shell::GetInstance()->system_tray() in system tray items

ui/views/bubble/tray_bubble_view.cc

 // Copyright (c) 2012 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 "ui/views/bubble/tray_bubble_view.h"
 
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
@@ skipping 288 matching lines @@
   bubble_content_mask_->layer()->SetBounds(layer()->bounds());
   GetWidget()->GetRootView()->SchedulePaint();
 }
 
 void TrayBubbleView::SetMaxHeight(int height) {
   params_.max_height = height;
   if (GetWidget())
     SizeToContents();
 }
 
+void TrayBubbleView::SetMinWidth(int width) {
+  if (params_.bubble_width >= width)
+    return;
+  params_.bubble_width = width;
+  if (GetWidget())
+    SizeToContents();
+}
+
 void TrayBubbleView::SetPaintArrow(bool paint_arrow) {
   bubble_border_->set_paint_arrow(paint_arrow);
 }
 
 gfx::Insets TrayBubbleView::GetBorderInsets() const {
   return bubble_border_->GetInsets();
 }
 
 void TrayBubbleView::Init() {
   views::BoxLayout* layout = new BottomAlignedBoxLayout(this);
@@ skipping 63 matching lines @@
                                           views::View* parent,
                                           views::View* child) {
   if (is_add && child == this) {
     parent->SetPaintToLayer(true);
     parent->SetFillsBoundsOpaquely(true);
     parent->layer()->SetMasksToBounds(true);
   }
 }
 
 }  // namespace views