views: Mark single-argument constructors as explicit.

ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc

Index: ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc
diff --git a/ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc b/ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc
index e209c8ba17049e21a65da93461712e95fc69052f..310b1223e44d7bbad19c8aad66d70e7cb3d62705 100644
--- a/ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc
+++ b/ui/views/controls/tabbed_pane/tabbed_pane_unittest.cc
@@ -1,4 +1,4 @@
-// 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.
 
@@ -15,10 +15,11 @@ 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_;
   }