Remove stylesheet injection from Blink.

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 1740 matching lines @@
             'page/DOMWindowPagePopup.cpp',
             'page/DOMWindowPagePopup.h',
             'page/DragController.cpp',
             'page/DragData.cpp',
             'page/EventHandler.cpp',
             'page/EventSource.cpp',
             'page/EventSource.h',
             'page/EventWithHitTestResults.h',
             'page/FocusController.cpp',
             'page/FrameTree.cpp',
-            'page/InjectedStyleSheets.cpp',
-            'page/InjectedStyleSheets.h',
             'page/NetworkStateNotifier.cpp',
             'page/NetworkStateNotifier.h',
             'page/Page.cpp',
             'page/Page.h',
             'page/PageAnimator.cpp',
             'page/PageAnimator.h',
             'page/PageLifecycleNotifier.cpp',
             'page/PageLifecycleNotifier.h',
             'page/PageLifecycleObserver.h',
             'page/PagePopupClient.cpp',
@@ skipping 2039 matching lines @@
             'paint/LayoutObjectDrawingRecorderTest.cpp',
             'paint/TextPainterTest.cpp',
             'paint/ViewDisplayListTest.cpp',
             'streams/ReadableStreamReaderTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }