Fix grammatical errors in comments in ui/views

ui/views/controls/tree/tree_view_views.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_
 #define UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 63 matching lines @@
   // editing a node, NULL is returned.
   ui::TreeModelNode* GetEditingNode();
 
   // Selects the specified node. This expands all the parents of node.
   void SetSelectedNode(ui::TreeModelNode* model_node);
 
   // Returns the selected node, or NULL if nothing is selected.
   ui::TreeModelNode* GetSelectedNode();
 
   // Marks |model_node| as collapsed. This only effects the UI if node and all
-  // it's parents are expanded (IsExpanded(model_node) returns true).
+  // its parents are expanded (IsExpanded(model_node) returns true).
   void Collapse(ui::TreeModelNode* model_node);
 
   // Make sure node and all its parents are expanded.
   void Expand(ui::TreeModelNode* node);
 
   // Invoked from ExpandAll(). Expands the supplied node and recursively
   // invokes itself with all children.
   void ExpandAll(ui::TreeModelNode* node);
 
   // Returns true if the specified node is expanded.
@@ skipping 76 matching lines @@
 
     // Width needed to display the string.
     void set_text_width(int width) { text_width_ = width; }
     int text_width() const { return text_width_; }
 
     // Returns the total number of descendants (including this node).
     int NumExpandedNodes();
 
     // Returns the max width of all descendants (including this node). |indent|
     // is how many pixels each child is indented and |depth| is the depth of
-    // this node from it's parent.
+    // this node from its parent.
     int GetMaxWidth(int indent, int depth);
 
    private:
     // The node from the model.
     ui::TreeModelNode* model_node_;
 
     // Whether the children have been loaded.
     bool loaded_children_;
 
     bool is_expanded_;
@@ skipping 168 matching lines @@
   // Offset the text is drawn at. This accounts for the size of the expand
   // control, icon and offsets.
   int text_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(TreeView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TREE_TREE_VIEW_VIEWS_H_