[Native File System] Use correct width for usage bubble.

Bubbles are typically narrower than modal dialogs.

Bug: 987285
Change-Id: Ic195d73e8040e45dd8c92f44838b31b5b38abcef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1737440
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684163}

chrome/browser/ui/views/native_file_system/native_file_system_usage_bubble_view.cc

@@ -402,7 +402,7 @@ void NativeFileSystemUsageBubbleView::CloseBubble() {
 
 gfx::Size NativeFileSystemUsageBubbleView::CalculatePreferredSize() const {
   const int width = ChromeLayoutProvider::Get()->GetDistanceMetric(
-                        DISTANCE_MODAL_DIALOG_PREFERRED_WIDTH) -
+                        DISTANCE_BUBBLE_PREFERRED_WIDTH) -
                     margins().width();
   return gfx::Size(width, GetHeightForWidth(width));
 }