Fixes error handling, leaks in secure sockets.

runtime/bin/secure_socket.h

Index: runtime/bin/secure_socket.h
diff --git a/runtime/bin/secure_socket.h b/runtime/bin/secure_socket.h
index bd5eda301e50cf7826d20714aac466ab4b8aed92..754d2402e62a30b5d0cf5d91eb6fc526adb59fb1 100644
--- a/runtime/bin/secure_socket.h
+++ b/runtime/bin/secure_socket.h
@@ -62,7 +62,9 @@ class SSLFilter {
         in_handshake_(false),
         hostname_(NULL) { }
 
-  void Init(Dart_Handle dart_this);
+  ~SSLFilter();
+
+  Dart_Handle Init(Dart_Handle dart_this);
   void Connect(const char* hostname,
                SSL_CTX* context,
                bool is_server,
@@ -120,7 +122,7 @@ class SSLFilter {
   static bool isBufferEncrypted(int i) {
     return static_cast<BufferIndex>(i) >= kFirstEncrypted;
   }
-  void InitializeBuffers(Dart_Handle dart_this);
+  Dart_Handle InitializeBuffers(Dart_Handle dart_this);
   void InitializePlatformData();
 
   DISALLOW_COPY_AND_ASSIGN(SSLFilter);