Remove obsolete global SubString method.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/24545002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16937 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/handles.cc

@@ -285,15 +285,6 @@ Handle<Object> LookupSingleCharacterStringFromCode(Isolate* isolate,
 }
 
 
-Handle<String> SubString(Handle<String> str,
-                         int start,
-                         int end,
-                         PretenureFlag pretenure) {
-  CALL_HEAP_FUNCTION(str->GetIsolate(),
-                     str->SubString(start, end, pretenure), String);
-}
-
-
 // Wrappers for scripts are kept alive and cached in weak global
 // handles referred from foreign objects held by the scripts as long as
 // they are used. When they are not used anymore, the garbage

src/handles.h

@@ -299,11 +299,6 @@ Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
 Handle<FixedArray> UnionOfKeys(Handle<FixedArray> first,
                                Handle<FixedArray> second);
 
-Handle<String> SubString(Handle<String> str,
-                         int start,
-                         int end,
-                         PretenureFlag pretenure = NOT_TENURED);
-
 // Sets the expected number of properties for the function's instances.
 void SetExpectedNofProperties(Handle<JSFunction> func, int nof);
 

src/objects.cc

@@ -9734,7 +9734,8 @@ bool SharedFunctionInfo::HasSourceCode() {
 Handle<Object> SharedFunctionInfo::GetSourceCode() {
   if (!HasSourceCode()) return GetIsolate()->factory()->undefined_value();
   Handle<String> source(String::cast(Script::cast(script())->source()));
-  return SubString(source, start_position(), end_position());
+  return GetIsolate()->factory()->NewSubString(
+      source, start_position(), end_position());
 }