Introduce the plumbing necessary to report Unrecoverable error from model safe workers.

chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc

Index: chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc
diff --git a/chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc b/chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc
index 63e6322550e0dedbf663e3daa57ea6884df451bb..dd8f61318b63225e029d3836aa1e8ed4834670cb 100644
--- a/chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc
+++ b/chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ -9,6 +10,7 @@
 #include "base/test/test_timeouts.h"
 #include "base/timer.h"
 #include "chrome/browser/sync/glue/browser_thread_model_worker.h"
+#include "chrome/browser/sync/util/unrecoverable_error_info.h"
 #include "content/browser/browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -38,23 +40,25 @@ class BrowserThreadModelWorkerTest : public testing::Test {
   // Schedule DoWork to be executed on the DB thread and have the test fail if
   // DoWork hasn't executed within action_timeout_ms() ms.
   void ScheduleWork() {
-    scoped_ptr<Callback0::Type> c(NewCallback(this,
-        &BrowserThreadModelWorkerTest::DoWork));
+   // We wait until the callback is done. So it is safe to use unretained.
+   WorkCallback c = base::Bind(&BrowserThreadModelWorkerTest::DoWork,
+                               base::Unretained(this));
     timer()->Start(
         FROM_HERE,
         TimeDelta::FromMilliseconds(TestTimeouts::action_timeout_ms()),
         this,
         &BrowserThreadModelWorkerTest::Timeout);
-    worker()->DoWorkAndWaitUntilDone(c.get());
+    worker()->DoWorkAndWaitUntilDone(c);
   }
 
   // This is the work that will be scheduled to be done on the DB thread.
-  void DoWork() {
+  UnrecoverableErrorInfo DoWork() {
     EXPECT_TRUE(BrowserThread::CurrentlyOn(BrowserThread::DB));
     timer_.Stop();  // Stop the failure timer so the test succeeds.
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE, new MessageLoop::QuitTask());
     did_do_work_ = true;
+    return UnrecoverableErrorInfo();
   }
 
   // This will be called by the OneShotTimer and make the test fail unless