Use ui::ImageModel instead of ImageSkia in SharesheetButton

Theres' no intended behavior change.

ui: :ImageModel should be preferred to gfx::ImageSkia.
Bug: 1048901, 1100034
Change-Id: I20d653317e3e8e0dd4782688e135f34f1507ef39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315664Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791263}

chrome/browser/ui/views/toolbar/sharesheet_button.cc

@@ -22,11 +22,12 @@ SharesheetButton::SharesheetButton(Browser* browser)
 SharesheetButton::~SharesheetButton() = default;
 
 void SharesheetButton::UpdateIcon() {
-  SetImage(
-      views::Button::STATE_NORMAL,
-      gfx::CreateVectorIcon(vector_icons::kHelpIcon, GetIconSize(),
-                            GetThemeProvider()->GetColor(
-                                ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON)));
+  SetImageModel(views::Button::STATE_NORMAL,
+                ui::ImageModel::FromVectorIcon(
+                    vector_icons::kHelpIcon,
+                    GetThemeProvider()->GetColor(
+                        ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON),
+                    GetIconSize()));
 }
 
 void SharesheetButton::ButtonPressed(views::Button* sender,