Add option to disable gdata.

chrome/browser/resources/options2/browser_options.html

 <div id="settings" class="page" hidden>
   <header>
     <h1 i18n-content="settingsTitle"></h1>
   </header>
 <if expr="not pp_ifdef('chromeos')">
   <include src="sync_section.html">
 </if>
 <if expr="pp_ifdef('chromeos')">
   <section>
     <h3 i18n-content="sectionTitleInternet"></h3>
@@ skipping 363 matching lines @@
     <button id="language-button"
         i18n-content="languageAndSpellCheckSettingsButton"></button>
     <div class="checkbox">
       <label>
         <input id="enableTranslate" pref="translate.enabled"
             metric="Options_Translate" type="checkbox">
         <span i18n-content="translateEnableTranslate"></span>
       </label>
     </div>
   </section>
-<if expr="not pp_ifdef('chromeos')">
   <section>
     <h3 i18n-content="downloadLocationGroupName"></h3>
     <div>
+<if expr="pp_ifdef('chromeos')">
+      <div class="checkbox">
+        <label>
+          <input type="checkbox" 
+          pref="gdata.disabled" 
+          metric="Options_DisableGData">
+          <span i18n-content="disableGData"></span>
+        </label>
+      </div>  
+</if>    
+<if expr="not pp_ifdef('chromeos')">
       <div class="settings-row">
         <label>
           <span i18n-content="downloadLocationBrowseTitle"></span>
           <input id="downloadLocationPath" class="weakrtl" type="text"
               pref="download.default_directory" size="36" readonly>
         </label>
         <button id="downloadLocationChangeButton"
             pref="download.prompt_for_download"
             i18n-content="downloadLocationChangeButton"></button>
       </div>
       <div class="checkbox">
         <label>
           <input type="checkbox"
               pref="download.prompt_for_download"
               metric="Options_AskForSaveLocation">
           <span i18n-content="downloadLocationAskForSaveLocation"></span>
         </label>
       </div>
       <div id="auto-open-file-types-section" hidden>
         <div id="auto-open-file-types-container">
           <div id="auto-open-file-types-label"
               i18n-content="autoOpenFileTypesInfo"></div>
           <button id="autoOpenFileTypesResetToDefault"
               i18n-content="autoOpenFileTypesResetToDefault"></button>
         </div>
       </div>
+</if>
     </div>
   </section>
-</if>
   <section>
       <h3 i18n-content="advancedSectionTitleSecurity"></h3>
       <div>
         <div class="settings-row">
           <button id="certificatesManageButton"
               i18n-content="certificatesManageButton"></button>
         </div>
         <div class="checkbox">
           <label>
             <input id="sslCheckRevocation" type="checkbox">
@@ skipping 61 matching lines @@
   </section>
 </if>
 </div>  <!-- advanced-settings-container -->
 </div>  <!-- advanced-settings -->
 <footer>
   <button id="advanced-settings-expander" class="link-button"
       i18n-content="showAdvancedSettings">
   </button>
 </footer>
 </div>