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..a403f6b77e248dfee522b4b786c8e5a96c78b260 100644
--- a/chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc
+++ b/chrome/browser/sync/glue/browser_thread_model_worker_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/test/test_timeouts.h"
 #include "base/timer.h"
 #include "chrome/browser/sync/glue/browser_thread_model_worker.h"
+#include "chrome/browser/sync/sessions/unrecoverable_error_info.h"
 #include "content/browser/browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -38,7 +39,8 @@ 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,
+    scoped_ptr<Callback1<sessions::UnrecoverableErrorInfo*>::Type> c(
+        NewCallback(this,
         &BrowserThreadModelWorkerTest::DoWork));
     timer()->Start(
         FROM_HERE,
@@ -49,7 +51,7 @@ class BrowserThreadModelWorkerTest : public testing::Test {
   }
 
   // This is the work that will be scheduled to be done on the DB thread.
-  void DoWork() {
+  void DoWork(sessions::UnrecoverableErrorInfo* error_info) {
     EXPECT_TRUE(BrowserThread::CurrentlyOn(BrowserThread::DB));
     timer_.Stop();  // Stop the failure timer so the test succeeds.
     BrowserThread::PostTask(