Fix memory leaks with V8 startup data.

testing/test_support.cpp

 // Copyright 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 "testing/test_support.h"
 
 #include <stdio.h>
 #include <string.h>
 
 #include <string>
@@ skipping 139 matching lines @@
 }
 
 #ifdef PDF_ENABLE_V8
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 bool InitializeV8ForPDFium(const std::string& exe_path,
                            const std::string& bin_dir,
                            v8::StartupData* natives_blob,
                            v8::StartupData* snapshot_blob,
                            v8::Platform** platform) {
   InitializeV8Common(exe_path.c_str(), platform);
-  if (!GetExternalData(exe_path, bin_dir, "natives_blob.bin", natives_blob))
-    return false;
-  if (!GetExternalData(exe_path, bin_dir, "snapshot_blob.bin", snapshot_blob))
-    return false;
-  v8::V8::SetNativesDataBlob(natives_blob);
-  v8::V8::SetSnapshotDataBlob(snapshot_blob);
+  if (natives_blob && snapshot_blob) {
+    if (!GetExternalData(exe_path, bin_dir, "natives_blob.bin", natives_blob))
+      return false;
+    if (!GetExternalData(exe_path, bin_dir, "snapshot_blob.bin", snapshot_blob))
+      return false;
+    v8::V8::SetNativesDataBlob(natives_blob);
+    v8::V8::SetSnapshotDataBlob(snapshot_blob);
+  }
   return true;
 }
 #else   // V8_USE_EXTERNAL_STARTUP_DATA
 bool InitializeV8ForPDFium(const std::string& exe_path,
                            v8::Platform** platform) {
   InitializeV8Common(exe_path.c_str(), platform);
   return true;
 }
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 #endif  // PDF_ENABLE_V8
@@ skipping 25 matching lines @@
 }
 
 // static
 int TestSaver::WriteBlockCallback(FPDF_FILEWRITE* pFileWrite,
                                   const void* data,
                                   unsigned long size) {
   TestSaver* pThis = static_cast<TestSaver*>(pFileWrite);
   pThis->m_String.append(static_cast<const char*>(data), size);
   return 1;
 }