[Sync] Fixing sync_driver lint violations and adding PRESUBMIT lint check.

components/sync_driver/model_association_manager_unittest.cc

Index: components/sync_driver/model_association_manager_unittest.cc
diff --git a/components/sync_driver/model_association_manager_unittest.cc b/components/sync_driver/model_association_manager_unittest.cc
index 4d78870a84c2cbc030674b415e38fa8c73a572ba..f1e9e1e4ca37e0451e878ad917b72d2f9039508f 100644
--- a/components/sync_driver/model_association_manager_unittest.cc
+++ b/components/sync_driver/model_association_manager_unittest.cc
@@ -35,7 +35,7 @@ FakeDataTypeController* GetController(
   if (it == controllers.end()) {
     return NULL;
   }
-  return (FakeDataTypeController*)(it->second.get());
+  return static_cast<FakeDataTypeController*>(it->second.get());
 }
 
 ACTION_P(VerifyResult, expected_result) {