MD History: Lazily load element files which are not needed for first paint

chrome/browser/resources/md_history/history_item.html

Index: chrome/browser/resources/md_history/history_item.html
diff --git a/chrome/browser/resources/md_history/history_item.html b/chrome/browser/resources/md_history/history_item.html
index bfff3846b2d430cd0e5988fa6c8e12a14cb3c326..d74b22f28211b7b049f53186420c3bc6b09690ef 100644
--- a/chrome/browser/resources/md_history/history_item.html
+++ b/chrome/browser/resources/md_history/history_item.html
@@ -2,8 +2,6 @@
 <link rel="import" href="chrome://resources/html/cr/ui/focus_row.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://resources/html/util.html">
@@ -12,6 +10,8 @@
 <link rel="import" href="chrome://history/searched_label.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
+<!-- Lazy loaded: paper-icon-button-light. -->
+
 <dom-module id="history-item">
   <template>
     <style include="shared-style">
@@ -21,6 +21,14 @@
         outline: none;
       }
 
+      /** Unresolved paper-icon-button-light styles. */
+      button {
+        background: none;
+        border: none;
+        outline: none;
+        padding: 0;
+      }
+
       :host(:not([embedded])) #main-container {
         position: relative;
       }