Remove unnecessary code from LayoutTextControl::ComputeIntrinsicLogicalWidths()

InnerEditor's paddings are always zero.  Web authors can't customize
InnerEditor's style.

This CL has no behavior changes.

Change-Id: Ida6e95a07c3c7c2f2d6700a54c5c40cf06835e99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449095
Commit-Queue: Kent Tamura <tkent@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813642}

third_party/blink/renderer/core/layout/layout_text_control.cc

@@ -230,13 +230,7 @@ MinMaxSizes LayoutTextControl::ComputeIntrinsicLogicalWidths() const {
 
   // Use average character width. Matches IE.
   sizes.max_size += PreferredContentLogicalWidth(GetAvgCharWidth(StyleRef()));
-  if (InnerEditorElement()) {
-    if (LayoutBox* inner_editor_layout_box =
-            InnerEditorElement()->GetLayoutBox()) {
-      sizes.max_size += inner_editor_layout_box->PaddingStart() +
-                        inner_editor_layout_box->PaddingEnd();
-    }
-  }
+
   if (!StyleRef().LogicalWidth().IsPercentOrCalc())
     sizes.min_size = sizes.max_size;
   return sizes;