[Multipaste] Adjust scaling of the copied img

This CL allows a copied image to be shrunk in order to fill the
contents area of a clipboard history menu item.

Bug: 1165286
Change-Id: I4ce2ce415021b04db4b5de67815791e5e052103f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627434Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Auto-Submit: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843133}

ash/clipboard/views/clipboard_history_bitmap_item_view.cc

@@ -261,11 +261,7 @@ class ClipboardHistoryBitmapItemView::BitmapContentsView
     float scaling_up_ratio = 0.f;
     switch (container_->data_format_) {
       case ui::ClipboardInternalFormat::kBitmap: {
-        if (width_ratio >= 1.f && height_ratio >= 1.f)
-          scaling_up_ratio = 1.f;
-        else
-          scaling_up_ratio = std::fmin(width_ratio, height_ratio);
-        DCHECK_LE(scaling_up_ratio, 1.f);
+        scaling_up_ratio = std::fmin(width_ratio, height_ratio);
         break;
       }
       case ui::ClipboardInternalFormat::kHtml: {