Use md-select instead of paper-dropdown-menu-light in internet page

chrome/browser/resources/settings/internet_page/network_proxy.html

 <link rel="import" href="chrome://resources/cr_elements/network/cr_onc_types.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_network_behavior.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_network_indicator.html">
 <link rel="import" href="chrome://resources/html/polymer.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-checkbox/paper-checkbox.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-dropdown-menu/paper-dropdown-menu-light.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input-container.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
+<link rel="import" href="/md_select_css.html">
 <link rel="import" href="internet_shared_css.html">
 <link rel="import" href="network_proxy_exclusions.html">
 <link rel="import" href="network_proxy_input.html">
 
 <dom-module id="network-proxy">
   <template>
-    <style include="internet-shared">
+    <style include="internet-shared md-select">
       cr-policy-network-indicator {
         -webkit-margin-end: 10px;
       }
 
       network-proxy-input {
         margin-bottom: 10px;
       }
 
       /* Use .middle spacing but no flex. */
       .settings-box .middle {
@@ skipping 20 matching lines @@
         <cr-policy-network-indicator
             property="[[networkProperties.ProxySettings.Type]]">
         </cr-policy-network-indicator>
         <div>$i18n{networkProxyEnforced}</div>
       </div>
     </div>
 
     <!-- Proxy type dropdown -->
     <div class="settings-box continuation">
       <div class="start">$i18n{networkProxyConnectionType}</div>
-      <paper-dropdown-menu-light vertical-align="auto" no-label-float>
-        <paper-listbox class="dropdown-content" on-iron-activate="onTypeChange_"
-            selected="[[proxy.Type]]" attr-for-selected="value">
+      <div class="md-select-wrapper">
+        <select id="proxyType" class="md-select" on-change="onTypeChange_"
+            value="[[proxy.Type]]">
           <template is="dom-repeat" items="[[proxyTypes_]]">
-            <button class="dropdown-item" role="option" value="[[item]]">
-              [[proxyTypeDesc_(item)]]
-            </button>
+            <option value="[[item]]">[[proxyTypeDesc_(item)]]</option>
           </template>
-        </paper-listbox>
-      </paper-dropdown-menu-light>
+        </select>
+        <span class="md-select-underline"></span>
+      </div>
     </div>
 
     <!-- Autoconfiguration (PAC) -->
     <div class="settings-box continuation"
         hidden$="[[!matches_(proxy.Type, ProxySettingsType_.PAC)]]">
       <div>$i18n{networkProxyAutoConfig}</div>
       <paper-input no-label-float class="middle" value="{{proxy.PAC}}"
           disabled="[[isNetworkPolicyEnforced(
                     networkProperties.ProxySettings.PAC)]]"
           on-blur="onProxyInputChange_">
@@ skipping 64 matching lines @@
           </paper-input-container>
           <paper-button on-tap="onAddProxyExclusionTap_">
             $i18n{networkProxyAddException}
           </paper-button>
         </div>
       </div>
     </div>
   </template>
   <script src="network_proxy.js"></script>
 </dom-module>