[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 c4dcdda0ecc59aaaa0c83c25ffdfc201702b25d9..e7949b0d78839bd690a035ead3af21c2fe42bd2b 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
@@ -420,48 +420,3 @@ suite('<history-synced-device-manager>', 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');
-    });
-  });
-});