API functions returning Promises should not throw exceptions.

Source/bindings/tests/results/V8TestInterface.cpp

Index: Source/bindings/tests/results/V8TestInterface.cpp
diff --git a/Source/bindings/tests/results/V8TestInterface.cpp b/Source/bindings/tests/results/V8TestInterface.cpp
index f2d2f31fcb8dd3da50725fe6eea58f35de573dd8..bb87a1ad313c597bf36e38de578eababb5239d74 100644
--- a/Source/bindings/tests/results/V8TestInterface.cpp
+++ b/Source/bindings/tests/results/V8TestInterface.cpp
@@ -812,8 +812,10 @@ static void implementsComplexMethodMethod(const v8::FunctionCallbackInfo<v8::Val
     TONATIVE_VOID(TestInterfaceEmpty*, testInterfaceEmptyArg, V8TestInterfaceEmpty::toNativeWithTypeCheck(info.GetIsolate(), info[1]));
     ExecutionContext* scriptContext = currentExecutionContext(info.GetIsolate());
     RefPtr<TestInterfaceEmpty> result = impl->implementsComplexMethod(scriptContext, strArg, testInterfaceEmptyArg, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValue(info, result.release());
 }
 
@@ -949,8 +951,10 @@ static void partialCallWithExecutionContextRaisesExceptionVoidMethodMethod(const
     ASSERT(impl);
     ExecutionContext* scriptContext = currentExecutionContext(info.GetIsolate());
     TestPartialInterface::partialCallWithExecutionContextRaisesExceptionVoidMethod(scriptContext, *impl, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
 }
 #endif // ENABLE(PARTIAL_CONDITION)