revert chat sample

samples/cpp/chat_sample/chat_sample.cpp

@@ -2,8 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #include "openvino/genai/llm_pipeline.hpp"
-#include <regex>
-#include <fstream>
 
 int main(int argc, char* argv[]) try {
     if (2 != argc) {
@@ -12,37 +10,9 @@ int main(int argc, char* argv[]) try {
     std::string prompt;
     std::string models_path = argv[1];
 
-    std::string model_path = models_path + "/openvino_model.xml";
-    std::string weights_path = std::regex_replace(model_path, std::regex(".xml"), ".bin");
-    std::ifstream model_file(model_path, std::ios::binary | std::ios::ate);
-    std::ifstream weights_file(weights_path, std::ios::binary | std::ios::ate);
-
-    if (!model_file.is_open() || !weights_file.is_open()) {
-        throw std::runtime_error("Cannot open model or weights file");
-    }
-
-    std::streamsize model_size = model_file.tellg();
-    std::streamsize weights_size = weights_file.tellg();
-
-    model_file.seekg(0, std::ios::beg);
-    weights_file.seekg(0, std::ios::beg);
-
-    std::vector<char> model_buffer(model_size);
-    std::vector<char> weights_buffer(weights_size);
-
-    if (!model_file.read(model_buffer.data(), model_size) || !weights_file.read(weights_buffer.data(), weights_size)) {
-        throw std::runtime_error("Error reading model or weights file");
-    }
-    std::vector<uint8_t> model_uint8_buffer(model_buffer.begin(), model_buffer.end());
-    std::vector<uint8_t> weights_uint8_buffer(weights_buffer.begin(), weights_buffer.end());
-
-
     std::string device = "CPU";  // GPU, NPU can be used as well
-    // ov::genai::LLMPipeline pipe(models_path, device);
+    ov::genai::LLMPipeline pipe(models_path, device);
 
-    ov::genai::Tokenizer tok(models_path);
-    ov::genai::LLMPipeline pipe(model_uint8_buffer, weights_uint8_buffer, tok, device);
-
     ov::genai::GenerationConfig config;
     config.max_new_tokens = 100;
     std::function<bool(std::string)> streamer = [](std::string word) {