[MD History] Make forward/backward work in grouped mode.

chrome/browser/resources/md_history/lazy_load.vulcanized.html

Index: chrome/browser/resources/md_history/lazy_load.vulcanized.html
diff --git a/chrome/browser/resources/md_history/lazy_load.vulcanized.html b/chrome/browser/resources/md_history/lazy_load.vulcanized.html
index 3c9413866d3d38592b07810359b5f6a29ee7e02e..9c958e047d957645a5d48fa6e9d668eaa6a481b2 100644
--- a/chrome/browser/resources/md_history/lazy_load.vulcanized.html
+++ b/chrome/browser/resources/md_history/lazy_load.vulcanized.html
@@ -250,6 +250,8 @@ history-item {
 </style>
   </template>
 </dom-module>
+
+
 <dom-module id="paper-button" assetpath="chrome://resources/polymer/v1_0/paper-button/" css-build="shadow">
   <template strip-whitespace="">
     <style scope="paper-button">:host {
@@ -369,7 +371,7 @@ paper-ripple {
 }
 
 :host([disabled]), .paper-item[disabled] {
-  color: var(--paper-item-disabled-color,var(--disabled-text-color));
+  color: var(--paper-item-disabled-color,var(--disabled-text-color));;
 
         ;
 }
@@ -395,6 +397,8 @@ paper-ripple {
 </style>
   </template>
 </dom-module>
+
+
 <dom-module id="paper-item" assetpath="chrome://resources/polymer/v1_0/paper-item/" css-build="shadow">
   <template>
     
@@ -425,7 +429,7 @@ paper-ripple {
 }
 
 :host([disabled]), .paper-item[disabled] {
-  color: var(--paper-item-disabled-color,var(--disabled-text-color));
+  color: var(--paper-item-disabled-color,var(--disabled-text-color));;
 
         ;
 }
@@ -492,6 +496,8 @@ paper-ripple {
 </dom-module>
 
 <script src="chrome://resources/polymer/v1_0/web-animations-js/web-animations-next-lite.min.js"></script>
+
+
 <dom-module id="iron-dropdown" assetpath="chrome://resources/polymer/v1_0/iron-dropdown/" css-build="shadow">
   <template>
     <style scope="iron-dropdown">:host {
@@ -520,8 +526,8 @@ paper-ripple {
   display: block;
         padding: 8px 0;
 
-        background: var(--paper-listbox-background-color,var(--primary-background-color));
-        color: var(--paper-listbox-color,var(--primary-text-color));
+        background: var(--paper-listbox-background-color,var(--primary-background-color));;
+        color: var(--paper-listbox-color,var(--primary-text-color));;
 
         ;
 }
@@ -1269,7 +1275,7 @@ paper-spinner {
 }
 
 paper-ripple {
-  color: var(--paper-tab-ink,var(--paper-yellow-a100));
+  color: var(--paper-tab-ink,var(--paper-yellow-a100));;
 }
 
 .tab-content > ::content > a {
@@ -1292,6 +1298,8 @@ paper-ripple {
 <g id="chevron-right"><path d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></g>
 </defs></svg>
 </iron-iconset-svg>
+
+
 <dom-module id="paper-tabs" assetpath="chrome://resources/polymer/v1_0/paper-tabs/" css-build="shadow">
   <template>
     <style scope="paper-tabs">:host {
@@ -1374,7 +1382,7 @@ paper-icon-button {
         bottom: 0;
         left: 0;
         right: 0;
-        background-color: var(--paper-tabs-selection-bar-color,var(--paper-yellow-a100));
+        background-color: var(--paper-tabs-selection-bar-color,var(--paper-yellow-a100));;
           -webkit-transform: scale(0);
         transform: scale(0);
           -webkit-transform-origin: left center;