Revert 112815 - [Sync] Make syncer commands avoid posting tasks on threads with no work to do

chrome/browser/sync/engine/apply_updates_command_unittest.cc

Index: chrome/browser/sync/engine/apply_updates_command_unittest.cc
===================================================================
--- chrome/browser/sync/engine/apply_updates_command_unittest.cc	(revision 112854)
+++ chrome/browser/sync/engine/apply_updates_command_unittest.cc	(working copy)
@@ -57,11 +57,12 @@
         make_scoped_refptr(new FakeModelWorker(GROUP_UI)));
     workers()->push_back(
         make_scoped_refptr(new FakeModelWorker(GROUP_PASSWORD)));
+    workers()->push_back(
+        make_scoped_refptr(new FakeModelWorker(GROUP_PASSIVE)));
     (*mutable_routing_info())[syncable::BOOKMARKS] = GROUP_UI;
     (*mutable_routing_info())[syncable::PASSWORDS] = GROUP_PASSWORD;
     (*mutable_routing_info())[syncable::NIGORI] = GROUP_PASSIVE;
     SyncerCommandTest::SetUp();
-    ExpectNoGroupsToChange(apply_updates_command_);
   }
 
   // Create a new unapplied folder node with a parent.
@@ -159,7 +160,6 @@
                                    DefaultBookmarkSpecifics(),
                                    "parent");
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_UI);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -195,7 +195,6 @@
                                    DefaultBookmarkSpecifics(),
                                    "parent");
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_UI);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -219,7 +218,6 @@
                                    DefaultBookmarkSpecifics(),
                                    "some_item");
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_UI);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -256,7 +254,6 @@
                                    DefaultBookmarkSpecifics(),
                                    root_server_id);
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_UI);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -295,7 +292,6 @@
       specifics.MutableExtension(sync_pb::password)->mutable_encrypted());
   CreateUnappliedNewItem("item", specifics, false);
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_PASSWORD);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -324,7 +320,6 @@
   encrypted_password.MutableExtension(sync_pb::password);
   CreateUnappliedNewItem("item3", encrypted_password, false);
 
-  ExpectGroupsToChange(apply_updates_command_, GROUP_UI, GROUP_PASSWORD);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -399,7 +394,6 @@
     CreateUnappliedNewItem("item2", specifics, false);
   }
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_PASSWORD);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -454,7 +448,6 @@
                          specifics, true);
   EXPECT_FALSE(cryptographer->has_pending_keys());
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_PASSIVE);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -506,7 +499,6 @@
                          specifics, true);
   EXPECT_FALSE(cryptographer->has_pending_keys());
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_PASSIVE);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -594,7 +586,6 @@
     EXPECT_EQ(2*batch_s+1, handles.size());
   }
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_PASSIVE);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();
@@ -697,7 +688,6 @@
     EXPECT_EQ(2*batch_s+1, handles.size());
   }
 
-  ExpectGroupToChange(apply_updates_command_, GROUP_PASSIVE);
   apply_updates_command_.ExecuteImpl(session());
 
   sessions::StatusController* status = session()->mutable_status_controller();