views: Mark single-argument constructors as explicit.

ui/views/touchui/touch_selection_controller_impl.cc

 // 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/views/touchui/touch_selection_controller_impl.h"
 
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ui_strings.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
@@ skipping 71 matching lines @@
   return (abs(delta_x) < kMinSelectionSize && abs(delta_y) < kMinSelectionSize);
 }
 
 }  // namespace
 
 namespace views {
 
 // A View that displays the text selection handle.
 class TouchSelectionControllerImpl::SelectionHandleView : public View {
  public:
-  SelectionHandleView(TouchSelectionControllerImpl* controller)
+  explicit SelectionHandleView(TouchSelectionControllerImpl* controller)
       : controller_(controller) {
     widget_.reset(CreateTouchSelectionPopupWidget());
     widget_->SetContentsView(this);
     widget_->SetAlwaysOnTop(true);
 
     // We are owned by the TouchSelectionController.
     set_parent_owned(false);
   }
 
   virtual ~SelectionHandleView() {
@@ skipping 90 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContextMenuButtonBackground);
 };
 
 // A View that displays the touch context menu.
 class TouchSelectionControllerImpl::TouchContextMenuView
     : public ButtonListener,
       public View {
  public:
-  TouchContextMenuView(TouchSelectionControllerImpl* controller)
+  explicit TouchContextMenuView(TouchSelectionControllerImpl* controller)
       : controller_(controller) {
     widget_.reset(CreateTouchSelectionPopupWidget());
     widget_->SetContentsView(this);
     widget_->SetAlwaysOnTop(true);
 
     // We are owned by the TouchSelectionController.
     set_parent_owned(false);
     SetLayoutManager(new BoxLayout(BoxLayout::kHorizontal, kContextMenuPadding,
         kContextMenuPadding, kContextMenuPadding));
   }
@@ skipping 274 matching lines @@
 bool TouchSelectionControllerImpl::IsSelectionHandle2Visible() {
   return selection_handle_2_->visible();
 }
 
 TouchSelectionController* TouchSelectionController::create(
     TouchSelectionClientView* client_view) {
   return new TouchSelectionControllerImpl(client_view);
 }
 
 }  // namespace views