accessibility: Simpler AXTree root accessor.

ui/accessibility/ax_tree.cc

Index: ui/accessibility/ax_tree.cc
diff --git a/ui/accessibility/ax_tree.cc b/ui/accessibility/ax_tree.cc
index 0d2b68eb819c6251fdabad9af49cc46201120f42..73b5c6d69765bcb9c3af06e673ec2d8e242fbc49 100644
--- a/ui/accessibility/ax_tree.cc
+++ b/ui/accessibility/ax_tree.cc
@@ -22,7 +22,7 @@ std::string TreeToStringHelper(AXNode* node, int indent) {
   return result;
 }
 
-}  // anonymous namespace
+}  // namespace
 
 // Intermediate state to keep track of during a tree update.
 struct AXTreeUpdateState {
@@ -67,10 +67,6 @@ void AXTree::SetDelegate(AXTreeDelegate* delegate) {
   delegate_ = delegate;
 }
 
-AXNode* AXTree::GetRoot() const {
-  return root_;
-}
-
 AXNode* AXTree::GetFromId(int32 id) const {
   base::hash_map<int32, AXNode*>::const_iterator iter = id_map_.find(id);
   return iter != id_map_.end() ? iter->second : NULL;