[Sync] Removing complexity around PROXY_TABS now that empty sessions are provided when disabled.

chrome/test/data/webui/md_history/history_synced_tabs_test.js

Index: chrome/test/data/webui/md_history/history_synced_tabs_test.js
diff --git a/chrome/test/data/webui/md_history/history_synced_tabs_test.js b/chrome/test/data/webui/md_history/history_synced_tabs_test.js
index 82aa414b94cbfc13b6424183266204b276c5e77f..c29da213099f4b18773c087d58533d961836b020 100644
--- a/chrome/test/data/webui/md_history/history_synced_tabs_test.js
+++ b/chrome/test/data/webui/md_history/history_synced_tabs_test.js
@@ -423,51 +423,6 @@ cr.define('md_history.history_synced_tabs_test', function() {
         registerMessageCallback('deleteForeignSession', this, undefined);
       });
     });
-
-    suite('<history-synced-device-manager> integration', function() {
-      var element;
-
-      setup(function() {
-        var app = replaceApp();
-        // Not rendered until selected.
-        assertEquals(null, app.$$('#synced-devices'));
-
-        app.selectedPage_ = 'syncedTabs';
-        assertEquals('syncedTabs', app.$['content-side-bar'].$.menu.selected);
-        return PolymerTest.flushTasks().then(function() {
-          element = app.$$('#synced-devices');
-          assertTrue(!!element);
-        });
-      });
-
-      test('enable and disable tab sync', function() {
-        updateSignInState(true);
-        var sessionList = [
-          createSession(
-              'Nexus 5',
-              [createWindow(['http://www.google.com', 'http://example.com'])]
-          )
-        ];
-        // Open tabs sync is enabled.
-        setForeignSessions(sessionList, true);
-
-        return PolymerTest.flushTasks().then(function() {
-          var cards = getCards(element);
-          assertEquals(1, cards.length);
-          assertTrue(element.$['no-synced-tabs'].hidden);
-
-          // Open tabs sync is disabled.
-          setForeignSessions(sessionList, false);
-
-          return PolymerTest.flushTasks();
-        }).then(function() {
-          cards = getCards(element);
-          assertEquals(0, cards.length);
-          // If tab sync is disabled, show 'no synced tabs'.
-          assertNoSyncedTabsMessageShown(element, 'noSyncedResults');
-        });
-      });
-    });
   }
   return {
     registerTests: registerTests