Revert "Leak per-isolate data in pdfium"

fpdfsdk/src/javascript/JS_Runtime.cpp

Index: fpdfsdk/src/javascript/JS_Runtime.cpp
diff --git a/fpdfsdk/src/javascript/JS_Runtime.cpp b/fpdfsdk/src/javascript/JS_Runtime.cpp
index 7ce8a5343b6a71324fca67d9b90f54c0faee4365..1e1486df5c796f6578c07eb71e942b2747c9d32f 100644
--- a/fpdfsdk/src/javascript/JS_Runtime.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime.cpp
@@ -63,13 +63,7 @@ CJS_Runtime::~CJS_Runtime() {
     delete m_ContextArray.GetAt(i);
 
   m_ContextArray.RemoveAll();
-
-  // TODO(raymes): Currently we're freeing per-isolate data everytime a
-  // document is destroyed even though it may be in use by other documents. For
-  // now we leak the per-isolate data (when m_isolateManaged is false) until
-  // crbug.com/531339 is fixed.
-  if (m_isolateManaged)
-    FXJS_ReleaseRuntime(GetIsolate(), m_context);
+  FXJS_ReleaseRuntime(GetIsolate(), m_context);
 
   m_pApp = NULL;
   m_pDocument = NULL;