Enable modal-dialog width in BubbleDialogModelHost

Widens modal dialogs from 320dp to 448dp, which is currently only
WindowNamePrompt.

Bug: 1106422
Change-Id: Id8db619b09bdb8cff8f6caaa3def215178558565
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453895
Auto-Submit: Peter Boström <pbos@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814388}

ui/views/bubble/bubble_dialog_model_host.cc

@@ -187,8 +187,11 @@ void BubbleDialogModelHost::OnDialogInitialized() {
 }
 
 gfx::Size BubbleDialogModelHost::CalculatePreferredSize() const {
-  // TODO(pbos): Move DISTANCE_BUBBLE_PREFERRED_WIDTH into views.
-  const int width = 320 - margins().width();
+  // TODO(pbos): Move DISTANCE_BUBBLE_PREFERRED_WIDTH and
+  // DISTANCE_MODAL_DIALOG_PREFERRED_WIDTH into views. 320 and 448 are inlined
+  // versions of these.
+  const int width =
+      (GetModalType() == ui::MODAL_TYPE_NONE ? 320 : 448) - margins().width();
   return gfx::Size(width, GetHeightForWidth(width));
 }