Changing Option String Resource to lowerCamelcases.

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 22 matching lines @@
               <span i18n-content="cookiesBlock"></span>
               <span class="controlled-setting-indicator"
                   content-setting="cookies" value="block"></span>
             </span>
           </label>
         </div>
         <div class="checkbox controlled-setting-with-label">
           <label>
             <input pref="profile.block_third_party_cookies" type="checkbox">
             <span>
-              <span i18n-content="cookies_block_3rd_party"></span>
+              <span i18n-content="cookiesBlock3rdParty"></span>
               <span class="controlled-setting-indicator"
                   pref="profile.block_third_party_cookies"></span>
           </label>
         </div>
         <!-- TODO(jochen): remove the div with the clear cookies on exit option
                            once this has shipped. -->
         <div class="checkbox" guest-visibility="disabled" hidden>
           <label>
             <input id="clear-cookies-on-exit"
                 pref="profile.clear_site_data_on_exit" type="checkbox">
-            <span i18n-content="cookies_lso_clear_when_close"
+            <span i18n-content="cookiesLsoClearWhenClose"
                 class="clear-plugin-lso-data-enabled"></span>
-            <span i18n-content="cookies_clear_when_close"
+            <span i18n-content="cookiesClearWhenClose"
                 class="clear-plugin-lso-data-disabled"></span>
           </label>
         </div>
         <div class="settings-row">
           <button class="exceptions-list-button" contentType="cookies"
               i18n-content="manageExceptions"></button>
           <button id="show-cookies-button"
-              i18n-content="cookies_show_cookies"></button>
+              i18n-content="cookiesShowCookies"></button>
         </div>
      </div>
       <div class="experimental-website-settings" hidden>
         <span id="cookies-default-string"></span>
         <div class="settings-row">
           <button class="website-settings-permission-button"
               contentType="cookies" i18n-content="websitesManage"></button>
           <button id="show-cookies-button"
-              i18n-content="cookies_show_cookies"></button>
+              i18n-content="cookiesShowCookies"></button>
         </div>
       </div>
     </section>
     <!-- Image filter -->
     <section>
       <h3 i18n-content="imagesTabLabel"></h3>
       <div class="replace-with-website-settings">
         <div class="radio controlled-setting-with-label">
           <label>
             <input type="radio" name="images" value="allow">
@@ skipping 77 matching lines @@
         </div>
         <div class="radio">
           <label>
             <input type="radio" name="handlers" value="block"
                 class="handler-radio">
             <span i18n-content="handlers_block"></span>
           </label>
         </div>
         <div class="settings-row">
           <button id="manage-handlers-button" contentType="handlers"
-              i18n-content="manage_handlers"></button>
+              i18n-content="manageHandlers"></button>
         </div>
       </div>
     </section>
     <!-- Plugins filter -->
     <section>
       <h3 i18n-content="pluginsTabLabel"></h3>
       <div class="replace-with-website-settings">
         <div class="radio controlled-setting-with-label">
           <label>
             <input type="radio" name="plugins" value="allow">
@@ skipping 411 matching lines @@
         <span id="multiple-automatic-downloads-default-string"></span>
         <div class="settings-row">
           <button class="website-settings-permission-button"
               contentType="multiple-automatic-downloads"
               i18n-content="websitesManage"></button>
         </div>
       </div>
     </section>
     <!-- MIDI system exclusive messages filter -->
     <section>
-      <h3 i18n-content="midi-sysex_header"></h3>
+      <h3 i18n-content="midiSysexHeader"></h3>
       <div>
         <div class="radio">
           <label>
             <input type="radio" name="midi-sysex" value="allow">
             <span i18n-content="midiSysExAllow"></span>
           </label>
         </div>
         <div class="radio">
           <label>
             <input type="radio" name="midi-sysex" value="ask">
             <span i18n-content="midiSysExAsk"></span>
           </label>
         </div>
         <div class="radio">
           <label>
             <input type="radio" name="midi-sysex" value="block">
             <span i18n-content="midiSysExBlock"></span>
           </label>
         </div>
         <div class="settings-row">
           <button class="exceptions-list-button" contentType="midi-sysex"
               i18n-content="manageExceptions"></button>
         </div>
       </div>
     </section>
     <!-- Push messaging filter -->
     <section id="experimental-push-messaging-settings" hidden="true">
-      <h3 i18n-content="push-messaging_header"></h3>
+      <h3 i18n-content="pushMessagingHeader"></h3>
       <div>
         <div class="radio">
           <label>
             <input type="radio" name="push-messaging" value="allow">
             <span i18n-content="pushMessagingAllow"></span>
           </label>
         </div>
         <div class="radio">
           <label>
             <input type="radio" name="push-messaging" value="ask">
             <span i18n-content="pushMessagingAsk"></span>
           </label>
         </div>
         <div class="radio">
           <label>
             <input type="radio" name="push-messaging" value="block">
             <span i18n-content="pushMessagingBlock"></span>
           </label>
         </div>
         <div class="settings-row">
           <button class="exceptions-list-button" contentType="push-messaging"
               i18n-content="manageExceptions"></button>
         </div>
       </div>
     </section>
     <!-- Page zoom levels -->
     <section id="page-zoom-levels">
-      <h3 i18n-content="zoomlevels_header"></h3>
+      <h3 i18n-content="zoomlevelsHeader"></h3>
       <div>
         <div class="settings-row">
           <button class="exceptions-list-button" contentType="zoomlevels"
               i18n-content="zoomLevelsManage"></button>
         </div>
       </div>
     </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>