[NTP] Fixing spacing for hardcoded bg selection tiles

The hardcoded "Upload from device" and "No background" tiles
were slightly misaligned. Partly due to a single character space
being inserted between inline-block elements. Fix the issues by
moving some properties between elements and setting the font size
of the parent to 0px. This fixes some problems with keyboard
navigation as well as the slight visual misalignment.

Bug: 937570
Change-Id: Iab866d50ae288d9bf4d5dc12280053253e6f3767
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1691260Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675696}

chrome/browser/resources/local_ntp/local_ntp.css

@@ -1047,10 +1047,8 @@ html[dir=rtl] .menu-option {
 
 #backgrounds-default.bg-sel-tile-bg {
   background-color: white;
-  border: 1px solid rgb(var(--GG300-rgb));
-  height: 174px;
-  margin-inline-end: 6px;
-  width: 174px;
+  height: 176px;
+  width: 176px;
 }
 
 #customization-menu .bg-sel-tile-bg.selected  {
@@ -1064,13 +1062,14 @@ html[dir=rtl] .menu-option {
   }
 }
 
+#backgrounds-menu {
+  /* Remove extra spacing between inline-block elements. */
+  font-size: 0;
+}
+
 #backgrounds-upload.bg-sel-tile-bg {
   background-color: white;
-  border: 1px solid rgb(var(--GG300-rgb));
-  height: 174px;
-  margin-inline-end: 6px;
   vertical-align: top;
-  width: 174px;
 }
 
 #menu-back-wrapper {
@@ -1137,6 +1136,8 @@ html[dir=rtl] #menu-back {
 }
 
 #backgrounds-upload-wrapper {
+  border: 1px solid rgb(var(--GG300-rgb));
+  box-sizing: border-box;
   display: inline-block;
   left: 0;
   opacity: 1;
@@ -1158,6 +1159,7 @@ html[dir=rtl] #menu-back {
 
 #backgrounds-upload-text {
   color: rgb(var(--GG700-rgb));
+  font-size: 13px;
   text-align: center;
   width: 100%;
 }
@@ -1191,6 +1193,8 @@ html[dir=rtl] #customization-menu .bg-sel-tile .selected-check {
 #backgrounds-default-icon {
   background-color: white;
   background-repeat: no-repeat;
+  border: 1px solid rgb(var(--GG300-rgb));
+  box-sizing: border-box;
   margin: auto;
   opacity: 1;
 }