Rework tree APIs to reflect Google style and more const-correctness....

chrome/browser/ui/views/info_bubble.cc

 // Copyright (c) 2011 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/views/info_bubble.h"
 
 #include <vector>
 
 #include "chrome/browser/ui/window_sizer.h"
 #include "chrome/common/notification_service.h"
@@ skipping 482 matching lines @@
 #endif
   SetBounds(window_bounds);
 }
 
 #if defined(OS_WIN)
 void InfoBubble::OnActivate(UINT action, BOOL minimized, HWND window) {
   // The popup should close when it is deactivated.
   if (action == WA_INACTIVE) {
     Close();
   } else if (action == WA_ACTIVE) {
-    DCHECK_GT(GetRootView()->GetChildViewCount(), 0);
+    DCHECK(GetRootView()->has_children());
     GetRootView()->GetChildViewAt(0)->RequestFocus();
   }
 }
 #elif defined(OS_LINUX)
 void InfoBubble::IsActiveChanged() {
   if (!IsActive())
     Close();
 }
 #endif
 
@@ skipping 44 matching lines @@
     animation_->Hide();
 }
 
 bool InfoBubble::AcceleratorPressed(const views::Accelerator& accelerator) {
   if (!delegate_ || delegate_->CloseOnEscape()) {
     DoClose(true);
     return true;
   }
   return false;
 }