Cleanup app snapshots on isolate/vm exit.

runtime/bin/isolate_data.h

Index: runtime/bin/isolate_data.h
diff --git a/runtime/bin/isolate_data.h b/runtime/bin/isolate_data.h
index 5ed1ed864f6398bfeb4ff04474587a72205e1841..505081e06304ceb79f9e10c02f52eaa7d262fcdb 100644
--- a/runtime/bin/isolate_data.h
+++ b/runtime/bin/isolate_data.h
@@ -13,6 +13,7 @@ namespace dart {
 namespace bin {
 
 // Forward declaration.
+class AppSnapshot;
 class EventHandler;
 class Loader;
 
@@ -23,34 +24,9 @@ class IsolateData {
  public:
   IsolateData(const char* url,
               const char* package_root,
-              const char* packages_file)
-      : script_url((url != NULL) ? strdup(url) : NULL),
-        package_root(NULL),
-        packages_file(NULL),
-        udp_receive_buffer(NULL),
-        builtin_lib_(NULL),
-        loader_(NULL) {
-    if (package_root != NULL) {
-      ASSERT(packages_file == NULL);
-      this->package_root = strdup(package_root);
-    } else if (packages_file != NULL) {
-      this->packages_file = strdup(packages_file);
-    }
-  }
-
-  ~IsolateData() {
-    free(script_url);
-    script_url = NULL;
-    free(package_root);
-    package_root = NULL;
-    free(packages_file);
-    packages_file = NULL;
-    free(udp_receive_buffer);
-    udp_receive_buffer = NULL;
-    if (builtin_lib_ != NULL) {
-      Dart_DeletePersistentHandle(builtin_lib_);
-    }
-  }
+              const char* packages_file,
+              AppSnapshot* app_snapshot);
+  ~IsolateData();
 
   Dart_Handle builtin_lib() const {
     ASSERT(builtin_lib_ != NULL);
@@ -83,6 +59,7 @@ class IsolateData {
  private:
   Dart_Handle builtin_lib_;
   Loader* loader_;
+  AppSnapshot* app_snapshot_;
 
   DISALLOW_COPY_AND_ASSIGN(IsolateData);
 };