Fix grammatical errors in comments in ui/views

ui/views/controls/tree/tree_view_views.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/controls/tree/tree_view_views.h"
 
 #include <algorithm>
 
 #include "base/i18n/rtl.h"
 #include "base/message_loop.h"
@@ skipping 373 matching lines @@
     return;
   bool reset_selection = false;
   for (int i = 0; i < count; ++i) {
     InternalNode* child_removing = parent_node->GetChild(start);
     if (selected_node_ && selected_node_->HasAncestor(child_removing))
       reset_selection = true;
     delete parent_node->Remove(child_removing);
   }
   if (reset_selection) {
     // selected_node_ is no longer valid (at the time we enter this function
-    // it's model_node() is likely deleted). Explicitly NULL out the field
+    // its model_node() is likely deleted). Explicitly NULL out the field
     // rather than invoking SetSelectedNode() otherwise, we'll try and use a
     // deleted value.
     selected_node_ = NULL;
     TreeModelNode* to_select = parent;
     if (parent == root_.model_node() && !root_shown_) {
       to_select = model_->GetChildCount(parent) > 0 ?
           model_->GetChild(parent, 0) : NULL;
     }
     SetSelectedNode(to_select);
   }
@@ skipping 496 matching lines @@
   if (!is_expanded_)
     return max_width;
   for (int i = 0; i < child_count(); ++i) {
     max_width = std::max(max_width,
                          GetChild(i)->GetMaxWidth(indent, depth + 1));
   }
   return max_width;
 }
 
 }  // namespace views