Fix null dereference on MemoryCache.

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 3805 matching lines @@
             'animation/animatable/AnimatableStrokeDasharrayListTest.cpp',
             'animation/animatable/AnimatableUnknownTest.cpp',
             'animation/animatable/AnimatableValueTestHelper.cpp',
             'animation/animatable/AnimatableValueTestHelper.h',
             'animation/animatable/AnimatableValueTestHelperTest.cpp',
             'clipboard/DataObjectTest.cpp',
             'css/AffectedByFocusTest.cpp',
             'css/CSSCalculationValueTest.cpp',
             'css/CSSFontFaceTest.cpp',
             'css/CSSSelectorTest.cpp',
+            'css/CSSStyleSheetResourceTest.cpp',
             'css/CSSTestHelper.cpp',
             'css/CSSTestHelper.h',
             'css/CSSValueTestHelper.h',
             'css/DragUpdateTest.cpp',
             'css/MediaQueryEvaluatorTest.cpp',
             'css/MediaQueryListTest.cpp',
             'css/MediaQueryMatcherTest.cpp',
             'css/MediaQuerySetTest.cpp',
             'css/MediaValuesTest.cpp',
             'css/RuleFeatureSetTest.cpp',
@@ skipping 139 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }