certificate manager: Disable export option for TPM-backed certs.

chrome/browser/resources/options2/certificate_manager.js

Index: chrome/browser/resources/options2/certificate_manager.js
diff --git a/chrome/browser/resources/options2/certificate_manager.js b/chrome/browser/resources/options2/certificate_manager.js
index e2e64250338e286e2fb535e68c46df7359614947..9d18ead80fd25bff284632f83ed3ee5baa280c14 100644
--- a/chrome/browser/resources/options2/certificate_manager.js
+++ b/chrome/browser/resources/options2/certificate_manager.js
@@ -116,12 +116,13 @@ cr.define('options', function() {
     updateButtonState: function(data) {
       var isCert = !!data && data.id.substr(0, 5) == 'cert-';
       var readOnly = !!data && data.readonly;
+      var hardwareBacked = !!data && data.hardware_backed;

[Evan Stade, 2012/05/21 21:14:58]

you don't need the !! as far as I'm aware (here or above)

[hshi1, 2012/05/21 21:17:44]

I'm not really familiar with this JS and would prefer to leave this logic as-is.

On 2012/05/21 21:14:58, Evan Stade wrote:

       var hasChildren = this.tree.items.length > 0;
       this.viewButton.disabled = !isCert;
       if (this.editButton !== null)
         this.editButton.disabled = !isCert;
       if (this.backupButton !== null)
-        this.backupButton.disabled = !isCert;
+        this.backupButton.disabled = !isCert || hardwareBacked;
       if (this.backupAllButton !== null)
         this.backupAllButton.disabled = !hasChildren;
       if (this.exportButton !== null)