Bug 495615: Remove 'Enable JavaScript Tracing' pref, r=gavin

mobile/chrome/content/browser.xul

@@ -359,9 +359,6 @@
             <richpref pref="javascript.enabled" type="bool" title="&enableJavaScript.title;">
               &enableJavaScript.description;
             </richpref>
-            <richpref pref="javascript.options.jit.content" type="bool" title="&javascript.options.jit.content.title;">
-              &javascript.options.jit.content.description;
-            </richpref>
             <richpref pref="plugins.enabled" type="bool" title="&enablePlugins.title;" onsynctopreference="Browser.setPluginState(this.value);">
               &enablePlugins.description;
             </richpref>

mobile/locales/en-US/chrome/preferences.dtd

@@ -2,8 +2,6 @@
 <!ENTITY showImages.title                          "Show images">
 <!ENTITY enableJavaScript.title                    "Enable JavaScript">
 <!ENTITY enableJavaScript.description              "Most interactive sites use JavaScript">
-<!ENTITY javascript.options.jit.content.title      "Enable JavaScript tracing">
-<!ENTITY javascript.options.jit.content.description "Use native‐code compilation in JavaScript">
 <!ENTITY enablePlugins.title                       "Enable Plugins">
 <!ENTITY enablePlugins.description                 "Plugins are used for special content such as video">
 <!ENTITY privacy.title                             "Privacy &amp; Security">