Fix error handling for message parse errors that occur during connection setup.

chrome/browser/extensions/api/cast_channel/cast_socket.h

Index: chrome/browser/extensions/api/cast_channel/cast_socket.h
diff --git a/chrome/browser/extensions/api/cast_channel/cast_socket.h b/chrome/browser/extensions/api/cast_channel/cast_socket.h
index dba56d7196f75314ba0a6c59b4f4db566a787a12..45383cdf879da4adc2707dd6a9ed31cceec4a35a 100644
--- a/chrome/browser/extensions/api/cast_channel/cast_socket.h
+++ b/chrome/browser/extensions/api/cast_channel/cast_socket.h
@@ -123,7 +123,7 @@ class CastSocket : public ApiResource,
   struct MessageHeader {
     MessageHeader();
     // Sets the message size.
-    void SetMessageSize(size_t message_size);
+    bool SetMessageSize(size_t message_size);
     // Prepends this header to |str|.
     void PrependToString(std::string* str);
     // Reads |header| from the beginning of |buffer|.