Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/webdatabase/SQLStatementSync.cpp

Index: Source/modules/webdatabase/SQLStatementSync.cpp
diff --git a/Source/modules/webdatabase/SQLStatementSync.cpp b/Source/modules/webdatabase/SQLStatementSync.cpp
index d5db05281ed7ee331316ebcfbbdc56b6e7b3bb29..17f1b700fa519b275f9c29055f78a4fb6318b75e 100644
--- a/Source/modules/webdatabase/SQLStatementSync.cpp
+++ b/Source/modules/webdatabase/SQLStatementSync.cpp
@@ -64,7 +64,7 @@ PassRefPtr<SQLResultSet> SQLStatementSync::execute(DatabaseSync* db, ExceptionSt
         else
             exceptionState.throwDOMException(SyntaxError, "Could not prepare statement.");
         db->setLastErrorMessage("could not prepare statement", result, database->lastErrorMsg());
-        return 0;
+        return nullptr;
     }
 
     if (statement.bindParameterCount() != m_arguments.size()) {
@@ -73,7 +73,7 @@ PassRefPtr<SQLResultSet> SQLStatementSync::execute(DatabaseSync* db, ExceptionSt
         else
             exceptionState.throwDOMException(SyntaxError, "Number of '?'s in statement string (" + String::number(statement.bindParameterCount()) + ") does not match the arguments provided (" + String::number(m_arguments.size()) + ").");
         db->setLastErrorMessage("number of '?'s in statement string does not match argument count");
-        return 0;
+        return nullptr;
     }
 
     for (unsigned i = 0; i < m_arguments.size(); ++i) {
@@ -81,13 +81,13 @@ PassRefPtr<SQLResultSet> SQLStatementSync::execute(DatabaseSync* db, ExceptionSt
         if (result == SQLResultFull) {
             exceptionState.throwDOMException(QuotaExceededError, SQLError::quotaExceededErrorMessage);
             db->setLastErrorMessage("there was not enough remaining storage space");
-            return 0;
+            return nullptr;
         }
 
         if (result != SQLResultOk) {
             exceptionState.throwDOMException(SQLDatabaseError, "Could not bind value.");
             db->setLastErrorMessage("could not bind value", result, database->lastErrorMsg());
-            return 0;
+            return nullptr;
         }
     }
 
@@ -112,7 +112,7 @@ PassRefPtr<SQLResultSet> SQLStatementSync::execute(DatabaseSync* db, ExceptionSt
         if (result != SQLResultDone) {
             exceptionState.throwDOMException(SQLDatabaseError, "Could not iterate results.");
             db->setLastErrorMessage("could not iterate results", result, database->lastErrorMsg());
-            return 0;
+            return nullptr;
         }
     } else if (result == SQLResultDone) {
         // Didn't find anything, or was an insert.
@@ -122,15 +122,15 @@ PassRefPtr<SQLResultSet> SQLStatementSync::execute(DatabaseSync* db, ExceptionSt
         // Quota error, the delegate will be asked for more space and this statement might be re-run.
         exceptionState.throwDOMException(QuotaExceededError, SQLError::quotaExceededErrorMessage);
         db->setLastErrorMessage("there was not enough remaining storage space");
-        return 0;
+        return nullptr;
     } else if (result == SQLResultConstraint) {
         exceptionState.throwDOMException(ConstraintError, "A constraint was violated.");
         db->setLastErrorMessage("statement failed due to a constraint failure");
-        return 0;
+        return nullptr;
     } else {
         exceptionState.throwDOMException(SQLDatabaseError, "Could not execute statement.");
         db->setLastErrorMessage("could not execute statement", result, database->lastErrorMsg());
-        return 0;
+        return nullptr;
     }
 
     resultSet->setRowsAffected(database->lastChanges());