Explicitly specify new Suggestion icon area size for tablets.

This change corrects definitions for suggestion icon area size and margins for
large screen devices.

This value is currently missing and inferred from small screen devices, which is
not adequate for tablets.

Bug: 982818
Change-Id: Id8d977760605b8c0504d939e3a9c9ab5282783bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868915Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Ender <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#707843}

chrome/android/java/res/values-sw600dp/dimens.xml

@@ -30,8 +30,9 @@
     <dimen name="omnibox_suggestion_start_offset_without_icon">@dimen/location_bar_icon_width</dimen>
     <dimen name="omnibox_suggestion_start_offset_with_icon">@dimen/omnibox_suggestion_start_offset_without_icon</dimen>
 
+    <dimen name="omnibox_suggestion_icon_area_size">40dp</dimen>
     <dimen name="omnibox_suggestion_36dp_icon_margin_start">0dp</dimen>
-    <dimen name="omnibox_suggestion_36dp_icon_margin_end">8dp</dimen>
+    <dimen name="omnibox_suggestion_36dp_icon_margin_end">4dp</dimen>
     <dimen name="omnibox_suggestion_24dp_icon_margin_start">8dp</dimen>
     <dimen name="omnibox_suggestion_24dp_icon_margin_end">8dp</dimen>