Fix grammatical errors in comments in ui/views

ui/views/layout/grid_layout.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 "ui/views/layout/grid_layout.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 879 matching lines @@
       view_state->baseline = view_state->view->GetBaseline();
 
     if (view_state->h_align == FILL) {
       // The view is resizable. As the pref height may vary with the width,
       // ask for the pref again.
       int actual_width =
           view_state->column_set->GetColumnWidth(view_state->start_col,
                                                  view_state->col_span);
       if (actual_width != view_state->pref_width &&
           !view_state->pref_height_fixed) {
-        // The width this view will get differs from it's preferred. Some Views
-        // pref height varies with it's width; ask for the preferred again.
+        // The width this view will get differs from its preferred. Some Views
+        // pref height varies with its width; ask for the preferred again.
         view_state->pref_height =
             view_state->view->GetHeightForWidth(actual_width);
         view_state->remaining_height = view_state->pref_height;
       }
     }
   }
 
   // Update the height/ascent/descent of each row from the views.
   std::vector<ViewState*>::iterator view_states_iterator = view_states_.begin();
   for (; view_states_iterator != view_states_.end() &&
@@ skipping 149 matching lines @@
 
 ColumnSet* GridLayout::GetLastValidColumnSet() {
   for (int i = current_row_ - 1; i >= 0; --i) {
     if (rows_[i]->column_set())
       return rows_[i]->column_set();
   }
   return NULL;
 }
 
 }  // namespace views