views: support dialog width snapping once and for all

chrome/browser/ui/views/harmony/harmony_layout_provider.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_HARMONY_HARMONY_LAYOUT_PROVIDER_H_
 #define CHROME_BROWSER_UI_VIEWS_HARMONY_HARMONY_LAYOUT_PROVIDER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/views/harmony/chrome_layout_provider.h"
 #include "chrome/browser/ui/views/harmony/harmony_typography_provider.h"
 
 class HarmonyLayoutProvider : public ChromeLayoutProvider {
  public:
   // The Harmony layout unit. All distances are in terms of this unit.
   static constexpr int kHarmonyLayoutUnit = 16;
 
   HarmonyLayoutProvider() {}
   ~HarmonyLayoutProvider() override {}
 
   gfx::Insets GetInsetsMetric(int metric) const override;
   int GetDistanceMetric(int metric) const override;
   views::GridLayout::Alignment GetControlLabelGridAlignment() const override;
   bool UseExtraDialogPadding() const override;
   bool ShouldShowWindowIcon() const override;
   bool IsHarmonyMode() const override;
-  int GetDialogPreferredWidth(DialogWidth width) const override;
   const views::TypographyProvider& GetTypographyProvider() const override;
+  int GetSnappedDialogWidth(int min_width) const override;
 
  private:
   const HarmonyTypographyProvider typography_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(HarmonyLayoutProvider);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_HARMONY_HARMONY_LAYOUT_PROVIDER_H_