Fix for Flutter issue 11260 (https://github.com/flutter/flutter/issues/11260)

runtime/bin/isolate_data.cc

Index: runtime/bin/isolate_data.cc
diff --git a/runtime/bin/isolate_data.cc b/runtime/bin/isolate_data.cc
index 52b2e48c3f9d3daead01bb43313e5690dd2f62f5..a91c228f9e280de5880041c15de3da6b07da4f64 100644
--- a/runtime/bin/isolate_data.cc
+++ b/runtime/bin/isolate_data.cc
@@ -17,7 +17,6 @@ IsolateData::IsolateData(const char* url,
     : script_url((url != NULL) ? strdup(url) : NULL),
       package_root(NULL),
       packages_file(NULL),
-      udp_receive_buffer(NULL),
       kernel_program(NULL),
       builtin_lib_(NULL),
       loader_(NULL),
@@ -45,8 +44,6 @@ IsolateData::~IsolateData() {
   package_root = NULL;
   free(packages_file);
   packages_file = NULL;
-  free(udp_receive_buffer);
-  udp_receive_buffer = NULL;
   if (kernel_program != NULL) {
     delete reinterpret_cast<kernel::Program*>(kernel_program);
     kernel_program = NULL;