Added group policies to enable/disable importing of data from other browsers.

chrome/browser/resources/options/import_data_overlay.js

Index: chrome/browser/resources/options/import_data_overlay.js
diff --git a/chrome/browser/resources/options/import_data_overlay.js b/chrome/browser/resources/options/import_data_overlay.js
index 71c8b42ff2930f70d420fb6f7f320dd1e9c1c08b..e6c6ae36c58275cce3dc0830b0095c3d7fb91eca 100644
--- a/chrome/browser/resources/options/import_data_overlay.js
+++ b/chrome/browser/resources/options/import_data_overlay.js
@@ -88,10 +88,12 @@ cr.define('options', function() {
      * @private
      */
     setControlsSensitive_: function(sensitive) {
-      var checkboxes =
-          document.querySelectorAll('#import-checkboxes input[type=checkbox]');
-      for (var i = 0; i < checkboxes.length; i++)
-        this.setUpCheckboxState_(checkboxes[i], sensitive);
+      var importOptions = ['history', 'favorites', 'passwords', 'search'];
+      for (var i = 0; i < importOptions.length; i++) {
+        var checkbox = $('import-' + importOptions[i]);
+        var enabled = !(checkbox.controlledBy == 'undefined') && sensitive;
+        this.setUpCheckboxState_(checkbox, enabled);
+      }
       $('import-data-commit').disabled = !sensitive;
     },
 
@@ -103,7 +105,6 @@ cr.define('options', function() {
      */
     setUpCheckboxState_: function(checkbox, enabled) {
       checkbox.disabled = !enabled;
-      checkbox.checked = enabled;
     },
 
     /**
@@ -118,8 +119,10 @@ cr.define('options', function() {
       var importOptions = ['history', 'favorites', 'passwords', 'search'];
       for (var i = 0; i < importOptions.length; i++) {
         var checkbox = $('import-' + importOptions[i]);
-        this.setUpCheckboxState_(checkbox,
-            browserProfile ? browserProfile[importOptions[i]] : false);
+        var enabled = (checkbox.controlledBy == 'undefined') &&
+                       (browserProfile ?
+                            browserProfile[importOptions[i]] : false);

[Mattias Nissler (ping if slow), 2011/07/20 09:28:31]

maybe break the line after the initial = and then the second line will maybe fit
without breaking after the ?

If you don't like this, then you need to fix alignment: one space less in 123
and 4 spaces indentation from 123 to 124

+        this.setUpCheckboxState_(checkbox, enabled);
       }
     },
 
@@ -152,6 +155,25 @@ cr.define('options', function() {
         this.validateCommitButton_();
       }
     },
+
+    /**
+    * Clear import prefs set when user checks/unchecks a checkbox so that the
+    * each checkbox goes back to the default "checked" state.
+    * @private
+    */
+    clearUserPrefs_: function() {
+       var importPrefs = ['import_history',
+                          'import_bookmarks',
+                          'import_saved_passwords',
+                          'import_search_engine'];
+       for (var i = 0; i < importPrefs.length; i++)
+          Preferences.clearPref(importPrefs[i], undefined);
+    },
+  };
+
+
+  ImportDataOverlay.clearUserPrefs = function() {
+    ImportDataOverlay.getInstance().clearUserPrefs_();
   };
 
   /**
@@ -185,6 +207,7 @@ cr.define('options', function() {
    * Remove the import overlay from display.
    */
   ImportDataOverlay.dismiss = function() {
+    ImportDataOverlay.clearUserPrefs();
     OptionsPage.closeOverlay();
   };