Make white background permanent

(imported from commit a9164b8f800cbc992ec72e9125a5adb08bb97615)

static/js/feature_flags.js

@@ -47,7 +47,6 @@ exports.use_socket = page_params.staging;
 exports.clicking_notification_causes_narrow = page_params.staging || is_customer4 ||
     _.contains(['customer25.invalid', 'mit.edu', 'customer21.invalid'], page_params.domain);
 
-exports.experimental_background = page_params.staging || _.contains(['mit.edu'], page_params.domain);
 exports.full_width = page_params.staging;
 
 exports.show_digest_email_setting = page_params.staging;

static/js/ui.js

@@ -851,25 +851,6 @@ exports.collapse_recipient_group = function (row) {
 
 /* EXPERIMENTS */
 
-/* This method allows an advanced user to use the console
- * to switch to a different pair of backgrounds for home
- * view and narrowed view. It either defaults to a specific
- * pair of colors, or allows the user to specify them.
- */
-exports.switchBackground = function (homecolor, narrowcolor) {
-    homecolor = homecolor || "#ffffff";
-    narrowcolor = narrowcolor || "#effcff";
-    $("#white-background-style").remove();
-    $('head').append('<style id="white-background-style" type="text/css">' +
-                         'body, #tab_bar, #tab_bar_underpadding, .message_list, #compose-container {' +
-                            'background-color: ' + homecolor + '; }' +
-                         'body.narrowed_view, .narrowed_view #tab_bar, .narrowed_view #tab_bar_underpadding,' +
-                         '.narrowed_view .message_list, .narrowed_view #compose-container {' +
-                            'background-color: ' + narrowcolor + '; }' +
-                       '</style>');
-    return ("Background has been changed");
-};
-
 /* This method allows an advanced user to use the console
  * to switch the application to span full width of the browser.
  */
@@ -1649,11 +1630,6 @@ $(function () {
         $("#group-pm-list").hide();
     }
 
-    // UI experiments
-    if (feature_flags.experimental_background) {
-        exports.switchBackground();
-    }
-
     if (feature_flags.full_width) {
         exports.switchToFullWidth();
     }

static/styles/zulip.css

@@ -15,7 +15,7 @@ body,
 #tab_bar_underpadding,
 .message_list,
 #compose-container {
-    background-color: #f4f5f4;
+    background-color: ##ffffff;
    -webkit-transition: background-color 200ms linear;
    -moz-transition: background-color 200ms linear;
    -o-transition: background-color 200ms linear;
@@ -28,7 +28,7 @@ body.narrowed_view,
 .narrowed_view #tab_bar_underpadding,
 .narrowed_view .message_list,
 .narrowed_view #compose-container {
-    background-color: #f0f8ff;
+    background-color: #effcff;
    -webkit-transition: background-color 200ms linear;
    -moz-transition: background-color 200ms linear;
    -o-transition: background-color 200ms linear;