IDL: Drop redundant null check for string and wrapper type attributes

Source/bindings/tests/idls/TestObject.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 145 matching lines @@
     static attribute long staticLongAttribute;
     // Exceptional type
     attribute EventHandler eventHandlerAttribute;
 
     // Extended attributes
     [LogActivity, LogAllWorlds] attribute long activityLoggingAccessForAllWorldsLongAttribute;
     [LogActivity=GetterOnly, LogAllWorlds] attribute long activityLoggingGetterForAllWorldsLongAttribute;
     [LogActivity=SetterOnly, LogAllWorlds] attribute long activityLoggingSetterForAllWorldsLongAttribute;
     [CachedAttribute=isValueDirty] attribute any cachedAttributeAnyAttribute;
     [CachedAttribute=isArrayDirty] attribute DOMString[] cachedArrayAttribute;
+    [CachedAttribute=isStringDirty] attribute DOMString? cachedStringOrNoneAttribute;
     [CallWith=ExecutionContext] attribute any callWithExecutionContextAnyAttribute;
     [CallWith=ScriptState] attribute any callWithScriptStateAnyAttribute;
     [CallWith=ExecutionContext|ScriptState] attribute any callWithExecutionContextAndScriptStateAnyAttribute;
     [CheckSecurity=Node] readonly attribute Document checkSecurityForNodeReadonlyDocumentAttribute; // All uses are read only
     [Conditional=CONDITION] attribute long conditionalLongAttribute;
     [Conditional=CONDITION_1&CONDITION_2] attribute long conditionalAndLongAttribute;
     [Conditional=CONDITION_1|CONDITION_2] attribute long conditionalOrLongAttribute;
     // Constructors: FIXME: replace suffix with [ConstructorAttribute]
     attribute TestInterfaceEmptyConstructor testInterfaceEmptyConstructorAttribute;
     [DeprecateAs=deprecatedTestInterfaceEmptyConstructorAttribute] attribute TestInterfaceEmptyConstructor testInterfaceEmptyConstructorAttribute;
@@ skipping 59 matching lines @@
     [Replaceable] readonly attribute long replaceableReadonlyLongAttribute;
     [Replaceable, PutForwards=href] readonly attribute TestNode locationReplaceable;
     [RuntimeEnabled=FeatureName] attribute long runtimeEnabledLongAttribute;
     [PerContextEnabled=FeatureName, RuntimeEnabled=FeatureName] attribute long perContextEnabledRuntimeEnabledLongAttribute;
     [Conditional=CONDITION, RuntimeEnabled=FeatureName] attribute long conditionalRuntimeEnabledLongAttribute;
     [SetterCallWith=ActiveWindow&FirstWindow] attribute DOMString setterCallWithActiveWindowAndFirstWindowStringAttribute;
     [SetterCallWith=ExecutionContext] attribute DOMString setterCallWithExecutionContextStringAttribute;
     [TreatNullAs=NullString] attribute DOMString treatNullAsNullStringStringAttribute;
     [TreatReturnedNullStringAs=Null] attribute DOMString treatReturnedNullStringAsNullStringAttribute;
     [TreatReturnedNullStringAs=Undefined] attribute DOMString treatReturnedNullStringAsUndefinedStringAttribute;
+    [TreatReturnedNullStringAs=Undefined, CachedAttribute=isStringDirty] attribute DOMString cachedTreatReturnedNullStringAsUndefinedStringAttribute;
     [TreatReturnedNullStringAs=Null] attribute ByteString treatReturnedNullStringAsNullByteStringAttribute;
     [TreatReturnedNullStringAs=Undefined] attribute ByteString treatReturnedNullStringAsUndefinedByteStringAttribute;
     [TreatReturnedNullStringAs=Null] attribute ScalarValueString treatReturnedNullStringAsNullScalarValueStringAttribute;
     [TreatReturnedNullStringAs=Undefined] attribute ScalarValueString treatReturnedNullStringAsUndefinedScalarValueStringAttribute;
     [TypeChecking=Interface] attribute float typeCheckingInterfaceFloatAttribute; // nop for non-interface types
     [TypeChecking=Interface] attribute TestInterface typeCheckingInterfaceTestInterfaceAttribute;
     [TypeChecking=Interface] attribute TestInterface? typeCheckingInterfaceTestInterfaceOrNullAttribute;
     [Reflect, URL] attribute DOMString urlStringAttribute;
     [Reflect=reflectUrlAttribute, URL] attribute DOMString urlStringAttribute;
     [Unforgeable] attribute long unforgeableLongAttribute;
-    [LogActivity=SetterOnly, LogPreviousValue] attribute long activityLoggingSetterOnlyLogPreviousValueAttribute;
+    [LogActivity=SetterOnly, LogPreviousValue] attribute DOMString? activityLoggingSetterOnlyLogPreviousValueAttribute;
     [LogActivity, LogPreviousValue] attribute TestInterfaceEmpty activityLoggingLogPreviousValueInterfaceAttribute;
 
 
     // Methods
     //
     // Naming convention:
     // ReturnType returnTypeMethodTypeName1ArgTypeName2Arg(Type1 typeName1Arg, Type2 typeName2Arg);
     // E.g.,
     // void voidMethodStringArgLongArrayArg(DOMString stringArg, long[] longArrayArg);
     void voidMethod();
@@ skipping 254 matching lines @@
     void voidMethodTestInterfaceWillBeGarbageCollectedArrayArg(TestInterfaceWillBeGarbageCollected[] testInterfaceWillBeGarbageCollectedArrayArg);
 
     // Extended attributes on referenced interfaces
     // (not self; self-reference tests at interface themselves)
     attribute TestInterface testInterfaceAttribute; // [ImplementedAs]
     attribute TestInterfaceGarbageCollected testInterfaceGarbageCollectedAttribute; // [GarbageCollected]
     attribute TestInterfaceGarbageCollected? testInterfaceGarbageCollectedOrNullAttribute; // [GarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected testInterfaceWillBeGarbageCollectedAttribute; // [WillBeGarbageCollected]
     attribute TestInterfaceWillBeGarbageCollected? testInterfaceWillBeGarbageCollectedOrNullAttribute; // [WillBeGarbageCollected]
 };