Tidy up <select>s in tabbed options.

chrome/browser/resources/options/browser_options.html

 <div id="browserPage" class="page hidden">
   <h1 i18n-content="browserPage"></h1>
   <section id="startupSection">
     <h3 i18n-content="startupGroupName"></h3>
     <div>
       <label class="radio"><input type="radio" name="startup"
           pref="session.restore_on_startup" value="0"
           metric="Options_Startup_Homepage">
           <span i18n-content="startupShowDefaultAndNewTab"></span></label>
       <label class="radio"><input type="radio" name="startup"
@@ skipping 47 matching lines @@
               metric="Options_Homepage_HomeButton" type="checkbox">
           <span i18n-content="toolbarShowHomeButton"></span>
         </label>
       </div>
     </div>
   </section>
   <section>
     <h3 i18n-content="defaultSearchGroupName"></h3>
       <div id="defaultSearchEngineGroup">
         <div>
-          <select id="defaultSearchEngine"
-              onchange="BrowserOptions.getInstance().setDefaultSearchEngine()">
-          </select>
+          <select id="defaultSearchEngine"></select>
           <button id="defaultSearchManageEnginesButton"
               i18n-content="defaultSearchManageEngines"></button>
         </div>
         <label class="checkbox" id="instantOption">
           <!-- TODO(estade): metric? -->
           <input type="checkbox" id="instantEnableCheckbox"
                  pref="instant.enabled">
           <span i18n-content="instantName"></span>
           <!-- This hidden checkbox allows us to get/set the state of the
                confirm_dialog_shown pref -->
@@ skipping 12 matching lines @@
     <h3 i18n-content="defaultBrowserGroupName"></h3>
     <div>
       <button id="defaultBrowserUseAsDefaultButton"
           i18n-content="defaultBrowserUseAsDefault"></button>
       <div id="defaultBrowserState"
           i18n-content="defaultBrowserUnknown"></div>
     </div>
   </section>
 </if>
 </div>