Bug 1366366 - Use non-animated robot icon with Marionette; r=Gijs

The browser/base/content/robot.ico resource is animated, displaying
a robot that occasionally rolls its eyes.  This causes fallouts
when taking screenshots of the entire ChromeWindow area, such as
https://bugzilla.mozilla.org/show_bug.cgi?id=1364762.

This patch provides a PNG copy of the robot that does not roll its eyes
for use with Marionette.

MozReview-Commit-ID: LFqamkfOXJO

--HG--
extra : rebase_source : 4057f6b1e30c042296c17cc1cfbe6107881f11e4

browser/base/jar.mn

@@ -129,6 +129,7 @@ browser.jar:
         content/browser/pageinfo/permissions.js       (content/pageinfo/permissions.js)
         content/browser/pageinfo/security.js          (content/pageinfo/security.js)
         content/browser/robot.ico                     (content/robot.ico)
+        content/browser/static-robot.png              (content/static-robot.png)
         content/browser/safeMode.css                  (content/safeMode.css)
         content/browser/safeMode.js                   (content/safeMode.js)
         content/browser/safeMode.xul                  (content/safeMode.xul)

browser/themes/shared/identity-block/identity-block.inc.css

@@ -217,7 +217,7 @@
 /* REMOTE CONTROL ICON */
 
 #main-window[remotecontrol] #remote-control-icon {
-  list-style-image: url(chrome://browser/content/robot.ico);
+  list-style-image: url(chrome://browser/content/static-robot.png);
   visibility: visible;
   width: 16px;
   height: 16px;