Disabling JavaScript in MHTML and limiting MHTML loading to top frames.

Source/web/web.gypi

 {
   'variables': {
     'web_files': [
       'AssertMatchingEnums.cpp',
       'AssociatedURLLoader.cpp',
       'AssociatedURLLoader.h',
       'BackForwardClientImpl.cpp',
       'BackForwardClientImpl.h',
       'ChromeClientImpl.cpp',
       'ChromeClientImpl.h',
@@ skipping 268 matching lines @@
       'tests/GIFImageDecoderTest.cpp',
       'tests/GraphicsContextTest.cpp',
       'tests/GraphicsLayerTest.cpp',
       'tests/ImageFilterBuilderTest.cpp',
       'tests/ImageLayerChromiumTest.cpp',
       'tests/JPEGImageDecoderTest.cpp',
       'tests/KeyboardTest.cpp',
       'tests/LinkHighlightTest.cpp',
       'tests/ListenerLeakTest.cpp',
       'tests/MemoryInfo.cpp',
+      'tests/MHTMLTest.cpp',
       'tests/MockWebGraphicsContext3D.h',
       'tests/OpaqueRectTrackingContentLayerDelegateTest.cpp',
       'tests/OpenTypeVerticalDataTest.cpp',
       'tests/PageSerializerTest.cpp',
       'tests/PaintAggregatorTest.cpp',
       'tests/PopupContainerTest.cpp',
       'tests/PopupMenuTest.cpp',
       'tests/PrerenderingTest.cpp',
       'tests/ProgrammaticScrollTest.cpp',
       'tests/RenderTableCellTest.cpp',
@@ skipping 64 matching lines @@
         {
           'web_unittest_files': [
             'tests/KeyCodeConversionTestGtk.cpp',
             'tests/WebInputEventFactoryTestGtk.cpp',
           ],
         }
       ],
     ],
   },
 }