[MD settings] hide extra horizontal scrollbar

chrome/browser/resources/settings/basic_page/basic_page.html

Index: chrome/browser/resources/settings/basic_page/basic_page.html
diff --git a/chrome/browser/resources/settings/basic_page/basic_page.html b/chrome/browser/resources/settings/basic_page/basic_page.html
index 47041e172e7d75ec0bf85780e2ffa77bf8030a49..3d04451c57f2455d980e80c59f607f3d50d8d685 100644
--- a/chrome/browser/resources/settings/basic_page/basic_page.html
+++ b/chrome/browser/resources/settings/basic_page/basic_page.html
@@ -36,6 +36,12 @@
 <dom-module id="settings-basic-page">
   <template>
     <style include="settings-page-styles">
+      :host {
+        /* Prevent an unwanted horizontal scrollbar when transitioning back from
+         * a sub-page. */
+        overflow: hidden;

[dpapad, 2017/03/16 20:51:19]

Does this create a problem when the page is too narrow? Ideally the user should
still be able to scroll left and right.

Perhaps it would be better to first understand why the scrollbar flashes on the
screen during the animation and possibly fix the root cause, instead of just
working around it?

[dschuyler, 2017/03/16 21:01:43]

The content is still fully accessible.
Can you be more specific about what you feel is incorrect?

[dpapad, 2017/03/16 21:13:52]

This suggestion was dependent on the question above. Since it works as expected,
it is not applicable. I should have made my comment more clear.

+      }
+
       #advancedToggle {
         --paper-button: {
           text-transform: none;