Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/api/serial/serial_api.cc

Index: chrome/browser/extensions/api/serial/serial_api.cc
diff --git a/chrome/browser/extensions/api/serial/serial_api.cc b/chrome/browser/extensions/api/serial/serial_api.cc
index 940ec5ed859c1eac3bc0506827afa16f24d2afc1..02fbe8d8ebcbf66a85ae445833866378f3cd2487 100644
--- a/chrome/browser/extensions/api/serial/serial_api.cc
+++ b/chrome/browser/extensions/api/serial/serial_api.cc
@@ -39,7 +39,7 @@ void SerialGetPortsFunction::Work() {
     ports->Append(Value::CreateStringValue(*i++));
   }
 
-  result_.reset(ports);
+  SetSingleResult(ports);
 }
 
 bool SerialGetPortsFunction::Respond() {
@@ -106,12 +106,12 @@ void SerialOpenFunction::Work() {
 
     DictionaryValue* result = new DictionaryValue();
     result->SetInteger(kConnectionIdKey, id);
-    result_.reset(result);
+    SetSingleResult(result);
     AsyncWorkCompleted();
   } else {
     DictionaryValue* result = new DictionaryValue();
     result->SetInteger(kConnectionIdKey, -1);
-    result_.reset(result);
+    SetSingleResult(result);
     AsyncWorkCompleted();
   }
 }
@@ -144,7 +144,7 @@ void SerialCloseFunction::Work() {
     close_result = true;
   }
 
-  result_.reset(Value::CreateBooleanValue(close_result));
+  SetSingleResult(Value::CreateBooleanValue(close_result));
 }
 
 bool SerialCloseFunction::Respond() {
@@ -182,7 +182,7 @@ void SerialReadFunction::Work() {
   result->SetInteger(kBytesReadKey, bytes_read);
   result->Set(kDataKey, base::BinaryValue::CreateWithCopiedBuffer(
       reinterpret_cast<char*>(&byte), bytes_read));
-  result_.reset(result);
+  SetSingleResult(result);
 }
 
 bool SerialReadFunction::Respond() {
@@ -219,7 +219,7 @@ void SerialWriteFunction::Work() {
 
   DictionaryValue* result = new DictionaryValue();
   result->SetInteger(kBytesWrittenKey, bytes_written);
-  result_.reset(result);
+  SetSingleResult(result);
 }
 
 bool SerialWriteFunction::Respond() {
@@ -249,7 +249,7 @@ void SerialFlushFunction::Work() {
     flush_result = true;
   }
 
-  result_.reset(Value::CreateBooleanValue(flush_result));
+  SetSingleResult(Value::CreateBooleanValue(flush_result));
 }
 
 bool SerialFlushFunction::Respond() {