Clean-up inline members of nested classes (content/)

content/renderer/renderer_accessibility_complete.cc

Index: content/renderer/renderer_accessibility_complete.cc
diff --git a/content/renderer/renderer_accessibility_complete.cc b/content/renderer/renderer_accessibility_complete.cc
index b28e71426a06b41eb1cc503f66c66a24f7f37ef2..56c743d0e2c7934d2e86fc4e888f262902acd310 100644
--- a/content/renderer/renderer_accessibility_complete.cc
+++ b/content/renderer/renderer_accessibility_complete.cc
@@ -222,6 +222,10 @@ void RendererAccessibilityComplete::HandleAccessibilityNotification(
   }
 }
 
+RendererAccessibilityComplete::BrowserTreeNode::BrowserTreeNode() : id(0) {}
+
+RendererAccessibilityComplete::BrowserTreeNode::~BrowserTreeNode() {}
+
 void RendererAccessibilityComplete::SendPendingAccessibilityNotifications() {
   const WebDocument& document = GetMainDocument();
   if (document.isNull())