views: Mark single-argument constructors as explicit.

ui/views/bubble/bubble_frame_view_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 "ui/base/hit_test.h"
 #include "ui/views/bubble/bubble_border.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/bubble/bubble_frame_view.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 21 matching lines @@
 };
 
 SizedBubbleDelegateView::SizedBubbleDelegateView() {}
 
 SizedBubbleDelegateView::~SizedBubbleDelegateView() {}
 
 gfx::Size SizedBubbleDelegateView::GetPreferredSize() { return kRect.size(); }
 
 class TestBubbleFrameView : public BubbleFrameView {
  public:
-  TestBubbleFrameView(const gfx::Rect& bounds);
+  explicit TestBubbleFrameView(const gfx::Rect& bounds);
   virtual ~TestBubbleFrameView();
 
  protected:
   virtual gfx::Rect GetMonitorBounds(const gfx::Rect& rect) OVERRIDE;
 
  private:
   gfx::Rect monitor_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(TestBubbleFrameView);
 };
@@ skipping 170 matching lines @@
       gfx::Size(500, 500),          // |client_size|
       false);                       // |try_mirroring_arrow|
   EXPECT_EQ(BubbleBorder::TOP_RIGHT, frame.bubble_border()->arrow_location());
   // The coordinates should be pointing to anchor_rect from TOP_RIGHT.
   EXPECT_LT(window_bounds.x(), 100 + 50 - 500);
   EXPECT_GT(window_bounds.y(), 900 + 50 - 10);  // -10 to roughly compensate for
                                                 // arrow overlap.
 }
 
 }  // namespace views