Fix all relative includes to third_party.

testing/embedder_test.cpp

 // Copyright (c) 2015 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "embedder_test.h"
 
 #include <limits.h>
 
 #include <list>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "../public/fpdf_dataavail.h"
 #include "../public/fpdf_text.h"
 #include "../public/fpdfview.h"
 #include "test_support.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 #ifdef PDF_ENABLE_V8
-#include "v8/include/libplatform/libplatform.h"
 #include "v8/include/v8.h"
+#include "v8/include/v8-platform.h"
 #endif  // PDF_ENABLE_V8
 
 namespace {
 const char* g_exe_path_ = nullptr;
 }  // namespace
 
 FPDF_BOOL Is_Data_Avail(FX_FILEAVAIL* pThis, size_t offset, size_t size) {
   return true;
 }
 
@@ skipping 246 matching lines @@
 }
 
 // Can't use gtest-provided main since we need to stash the path to the
 // executable in order to find the external V8 binary data files.
 int main(int argc, char** argv) {
   g_exe_path_ = argv[0];
   testing::InitGoogleTest(&argc, argv);
   testing::InitGoogleMock(&argc, argv);
   return RUN_ALL_TESTS();
 }