views: Mark single-argument constructors as explicit.

ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/controls/tabbed_pane/tabbed_pane.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace views {
 
 // A view for testing that takes a fixed preferred size upon construction.
 class FixedSizeView : public View {
  public:
-  FixedSizeView(const gfx::Size& size)
+  explicit FixedSizeView(const gfx::Size& size)
     : size_(size) {}
 
-  virtual gfx::Size GetPreferredSize() {
+  // Overridden from View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE {
     return size_;
   }
 
  private:
   const gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(FixedSizeView);
 };
 
 class TabbedPaneTest : public ViewsTestBase,
@@ skipping 94 matching lines @@
   // Now change the selected tab.
   tabbed_pane_->SelectTabAt(1);
   EXPECT_EQ(1, tabbed_pane_->GetSelectedTabIndex());
 
   // Remove the first one.
   delete tabbed_pane_->RemoveTabAtIndex(0);
   EXPECT_EQ(0, tabbed_pane_->GetSelectedTabIndex());
 }
 
 } // namespace views