API functions returning Promises should not throw exceptions.

Source/bindings/tests/results/V8TestInterface2.cpp

Index: Source/bindings/tests/results/V8TestInterface2.cpp
diff --git a/Source/bindings/tests/results/V8TestInterface2.cpp b/Source/bindings/tests/results/V8TestInterface2.cpp
index f77a8262892b3ab0ca2743a8ac540edda8f79d69..70bf888b644b81e94ef216ec7dbe7414ddc64571 100644
--- a/Source/bindings/tests/results/V8TestInterface2.cpp
+++ b/Source/bindings/tests/results/V8TestInterface2.cpp
@@ -58,8 +58,10 @@ static void itemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
     TestInterface2* impl = V8TestInterface2::toNative(info.Holder());
     V8TRYCATCH_EXCEPTION_VOID(unsigned, index, toUInt32(info[0], exceptionState), exceptionState);
     RefPtr<TestInterfaceEmpty> result = impl->item(index, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValue(info, result.release());
 }
 
@@ -81,8 +83,10 @@ static void setItemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
     V8TRYCATCH_EXCEPTION_VOID(unsigned, index, toUInt32(info[0], exceptionState), exceptionState);
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, value, info[1]);
     String result = impl->setItem(index, value, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValueString(info, result, info.GetIsolate());
 }
 
@@ -103,8 +107,10 @@ static void deleteItemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
     TestInterface2* impl = V8TestInterface2::toNative(info.Holder());
     V8TRYCATCH_EXCEPTION_VOID(unsigned, index, toUInt32(info[0], exceptionState), exceptionState);
     bool result = impl->deleteItem(index, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValueBool(info, result);
 }
 
@@ -125,8 +131,10 @@ static void namedItemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
     TestInterface2* impl = V8TestInterface2::toNative(info.Holder());
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, name, info[0]);
     RefPtr<TestInterfaceEmpty> result = impl->namedItem(name, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValue(info, result.release());
 }
 
@@ -148,8 +156,10 @@ static void setNamedItemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, name, info[0]);
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, value, info[1]);
     String result = impl->setNamedItem(name, value, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValueString(info, result, info.GetIsolate());
 }
 
@@ -170,8 +180,10 @@ static void deleteNamedItemMethod(const v8::FunctionCallbackInfo<v8::Value>& inf
     TestInterface2* impl = V8TestInterface2::toNative(info.Holder());
     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, name, info[0]);
     bool result = impl->deleteNamedItem(name, exceptionState);
-    if (exceptionState.throwIfNeeded())
+    if (exceptionState.hadException()) {
+        exceptionState.throwIfNeeded();
         return;
+    }
     v8SetReturnValueBool(info, result);
 }