Removed IllegalAccessException and UnsupportedOperationException.

samples/ui_lib/layout/GridLayoutParams.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Caches the layout parameters that were specified in CSS during a layout
  * computation. These values are immutable during a layout.
  */
 // TODO(jmesserly): I would like all fields to be final, but it's too painful
 // to do this right now in Dart. If I create a factory constructor, then I need
@@ skipping 26 matching lines @@
 
     rowSpan = StringUtils.parseInt(view.customStyle['grid-row-span']);
     columnSpan = StringUtils.parseInt(view.customStyle['grid-column-span']);
 
     var line = _GridItemParser.parse(
         view.customStyle['grid-row'], layout.rows);
     if (line != null) {
       row = line.start;
       if (line.length != null) {
         if (rowSpan != null) {
-          throw new UnsupportedOperationException(
+          throw new UnsupportedError(
             'grid-row-span cannot be with grid-row that defines an end');
         }
         rowSpan = line.length;
       }
     }
 
     line = _GridItemParser.parse(
         view.customStyle['grid-column'], layout.columns);
 
     if (line != null) {
       column = line.start;
       if (line.length != null) {
         if (columnSpan != null) {
-          throw new UnsupportedOperationException(
+          throw new UnsupportedError(
             'grid-column-span cannot be with grid-column that defines an end');
         }
         columnSpan = line.length;
       }
     }
 
     String cell = _GridTemplateParser.parseCell(view.customStyle['grid-cell']);
     if (cell != null && cell != 'none') {
       // TODO(jmesserly): I didn't see anything spec'd about conflicts and
       // error handling. For now, throw an error on a misconfigured view.
       // CSS is designed to be a permissive language, though, so we should do
       // better and resolve conflicts more intelligently.
       if (row != null || column != null ||
           rowSpan != null || columnSpan != null) {
-        throw new UnsupportedOperationException(
+        throw new UnsupportedError(
             'grid-cell cannot be used with grid-row and grid-column');
       }
 
       if (layout.template == null) {
-        throw new UnsupportedOperationException(
+        throw new UnsupportedError(
             'grid-cell requires that grid-template is set on the parent');
       }
 
       final rect = layout.template.lookupCell(cell);
       row = rect.row;
       column = rect.column;
       rowSpan = rect.rowSpan;
       columnSpan = rect.columnSpan;
 
     } else {
       // Apply default row, column span values.
       if (rowSpan == null) rowSpan = 1;
       if (columnSpan == null) columnSpan = 1;
 
       if (row == null && column == null) {
-        throw new  UnsupportedOperationException('grid-flow is not implemented'
+        throw new  UnsupportedError('grid-flow is not implemented'
             + ' so at least one row or one column must be defined');
       }
 
       if (row == null) row = 1;
       if (column == null) column = 1;
     }
 
     assert(row > 0 && rowSpan > 0 && column > 0 && columnSpan > 0);
   }
 }