Move the writing of the MHTML footer to the browser process.

third_party/WebKit/Source/web/tests/MHTMLTest.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 141 matching lines @@
     // all the examples in the MHTML spec - RFC 2557.
     String boundary = String::fromUTF8("boundary-example");
 
     RefPtr<RawData> mhtmlData = RawData::create();
     MHTMLArchive::generateMHTMLHeader(boundary, title, mimeType,
                                       *mhtmlData->mutableData());
     for (const auto& resource : resources) {
       MHTMLArchive::generateMHTMLPart(boundary, String(), encodingPolicy,
                                       resource, *mhtmlData->mutableData());
     }
-    MHTMLArchive::generateMHTMLFooter(boundary, *mhtmlData->mutableData());
+    MHTMLArchive::generateMHTMLFooterForTesting(boundary,
+                                                *mhtmlData->mutableData());
     return mhtmlData.release();
   }
 
   PassRefPtr<RawData> serialize(const char* title,
                                 const char* mime,
                                 MHTMLArchive::EncodingPolicy encodingPolicy) {
     return generateMHTMLData(m_resources, encodingPolicy, title, mime);
   }
 
  private:
@@ skipping 105 matching lines @@
   // Full sandboxing should be turned on.
   EXPECT_TRUE(document->isSandboxed(SandboxAll));
 
   // MHTML document should be loaded into unique origin.
   EXPECT_TRUE(document->getSecurityOrigin()->isUnique());
   // Script execution should be disabled.
   EXPECT_FALSE(document->canExecuteScripts(NotAboutToExecuteScript));
 }
 
 }  // namespace blink