Changing Option String Resource to lowerCamelcases in handler_options_handler.cc file.

chrome/browser/resources/options/content_settings.html

 <div id="content-settings-page" class="page" hidden>
   <div class="close-button"></div>
   <h1 i18n-content="contentSettingsPage"></h1>
   <div class="content-area">
     <!-- Cookie filter tab contents -->
     <section>
       <h3 i18n-content="cookiesTabLabel"></h3>
       <div class="replace-with-website-settings">
         <div class="radio controlled-setting-with-label">
           <label>
@@ skipping 132 matching lines @@
       <div class="experimental-website-settings" hidden>
         <span id="javascript-default-string"></span>
         <div class="settings-row">
           <button class="website-settings-permission-button"
               contentType="javascript" i18n-content="websitesManage"></button>
         </div>
       </div>
     </section>
     <!-- Handlers settings -->
     <section id="handlers-section">
-      <h3 i18n-content="handlers_tab_label"></h3>
+      <h3 i18n-content="handlersTabLabel"></h3>
       <div>
         <div class="radio">
           <label>
             <input type="radio" name="handlers" value="allow"
                 class="handler-radio">
-            <span i18n-content="handlers_allow"></span>
+            <span i18n-content="handlersAllow"></span>
           </label>
         </div>
         <div class="radio">
           <label>
             <input type="radio" name="handlers" value="block"
                 class="handler-radio">
-            <span i18n-content="handlers_block"></span>
+            <span i18n-content="handlersBlock"></span>
           </label>
         </div>
         <div class="settings-row">
           <button id="manage-handlers-button" contentType="handlers"
               i18n-content="manageHandlers"></button>
         </div>
       </div>
     </section>
     <!-- Plugins filter -->
     <section>
@@ skipping 490 matching lines @@
     </section>
   </div>
   <div class="action-area">
     <div class="button-strip">
       <button id="content-settings-overlay-confirm" class="default-button"
           i18n-content="done">
       </button>
     </div>
   </div>
 </div>