Disable modifying extensions when in managed mode.

chrome/browser/resources/uber/uber_shared.css

Index: chrome/browser/resources/uber/uber_shared.css
===================================================================
--- chrome/browser/resources/uber/uber_shared.css	(revision 142678)
+++ chrome/browser/resources/uber/uber_shared.css	(working copy)
@@ -116,3 +116,49 @@
 body.uber-frame section > div:only-of-type {
   -webkit-box-flex: 1;
 }
+
+/* Styles for a hideable notification banner at the top of a page.
+ * See the Options page .managed-prefs-banner for a usage example.
+ */

[Evan Stade, 2012/06/20 21:27:35]

move */ to previous line.

+.page.showing-banner {
+  margin-top: 45px;
+}
+
+.page-banner {
+  background-color: white;
+  width: 100%;
+  z-index: 2;
+}
+
+.page:not(.showing-banner) .page-banner {
+  display: none;
+}
+
+.page-banner-gradient {
+  background: -webkit-linear-gradient(rgb(255, 242, 183),
+                                      rgb(250, 230, 145));
+  border: 1px solid rgb(201, 189, 141);
+  border-radius: 3px;
+  height: 25px;
+  margin: 9px 9px 0 9px;
+}
+
+.page-banner .page-banner-gradient {
+  -webkit-margin-end: 20px;
+  -webkit-margin-start: 0;
+  margin-bottom: 9px;
+}
+
+.page-banner-text {
+  background-image: url('chrome://theme/IDR_MANAGED');

[Evan Stade, 2012/06/20 21:27:35]

I'm not sure that every page installs a theme data source, meaning this might
not work if you navigated to some uber pages without first navigating to the NTP
(or any page that installs the correct data source). All the more reason we
should move theme data source registration to profile startup.

[Pam (message me for reviews), 2012/06/21 16:38:13]

Currently it's only used on the Settings and Extensions pages, which appear to
install theme data. Judging from your LGTM, that's sufficient for now?

+  background-position: 5px center;
+  background-repeat: no-repeat;
+  display: block;
+  line-height: 24px;
+  padding-left: 26px;
+}
+
+.page-banner.clickable:active .page-banner-text {
+  background: -webkit-linear-gradient(rgb(250, 230, 145),
+                                      rgb(255, 242, 183));
+}