Remove FastAllocBase.h

third_party/WebKit/Source/wtf/wtf.gypi

 # For GN compatibility, this file can not have any conditions.
 {
     'variables': {
         'wtf_files': [
             'ASCIICType.cpp',
             'ASCIICType.h',
             'AddressSanitizer.h',
             'AddressSpaceRandomization.cpp',
             'AddressSpaceRandomization.h',
             'Alias.cpp',
@@ skipping 32 matching lines @@
             'DataLog.cpp',
             'DataLog.h',
             'DateMath.cpp',
             'DateMath.h',
             'DefaultAllocator.cpp',
             'DefaultAllocator.h',
             'Deque.h',
             'DoublyLinkedList.h',
             'DynamicAnnotations.cpp',
             'DynamicAnnotations.h',
-            'FastAllocBase.h',
             'FilePrintStream.cpp',
             'FilePrintStream.h',
             'Float32Array.h',
             'Float64Array.h',
             'Forward.h',
             'Functional.h',
             'GetPtr.h',
             'HashCountedSet.h',
             'HashFunctions.h',
             'HashIterators.h',
@@ skipping 173 matching lines @@
             'text/StringOperatorsTest.cpp',
             'text/TextCodecReplacementTest.cpp',
             'text/TextCodecUTF8Test.cpp',
             'text/WTFStringTest.cpp',
         ],
         'wtf_unittest_helper_files': [
             'testing/WTFTestPrinters.cpp',
         ],
     },
 }