[cleanup] Remove unused JS helper utils.InstallGetterSetter

R=gsathya@chromium.org

Review-Url: https://codereview.chromium.org/2615733002
Cr-Commit-Position: refs/heads/master@{#42074}

src/js/prologue.js

@@ -112,20 +112,6 @@ function InstallGetter(object, name, getter, attributes, prefix) {
 }
 
 
-// Helper function to install a getter/setter accessor property.
-function InstallGetterSetter(object, name, getter, setter, attributes) {
-  %CheckIsBootstrapping();
-  if (IS_UNDEFINED(attributes)) attributes = DONT_ENUM;
-  SetFunctionName(getter, name, "get");
-  SetFunctionName(setter, name, "set");
-  %FunctionRemovePrototype(getter);
-  %FunctionRemovePrototype(setter);
-  %DefineAccessorPropertyUnchecked(object, name, getter, setter, attributes);
-  %SetNativeFlag(getter);
-  %SetNativeFlag(setter);
-}
-
-
 function OverrideFunction(object, name, f, afterInitialBootstrap) {
   %CheckIsBootstrapping();
   %object_define_property(object, name, { value: f,
@@ -270,7 +256,6 @@ utils.SetFunctionName = SetFunctionName;
 utils.InstallConstants = InstallConstants;
 utils.InstallFunctions = InstallFunctions;
 utils.InstallGetter = InstallGetter;
-utils.InstallGetterSetter = InstallGetterSetter;
 utils.OverrideFunction = OverrideFunction;
 utils.SetUpLockedPrototype = SetUpLockedPrototype;
 utils.PostNatives = PostNatives;