Fold wtf/Platform.h into config.h

Source/wtf/wtf.gypi

 {
     'variables': {
         'wtf_files': [
             'ASCIICType.h',
             'Alignment.h',
             'ArrayBuffer.cpp',
             'ArrayBuffer.h',
             'ArrayBufferContents.cpp',
             'ArrayBufferContents.h',
             'ArrayBufferDeallocationObserver.h',
@@ skipping 76 matching lines @@
             'ParallelJobs.h',
             'ParallelJobsGeneric.cpp',
             'ParallelJobsGeneric.h',
             'ParallelJobsLibdispatch.h',
             'PartitionAlloc.cpp',
             'PartitionAlloc.h',
             'PassOwnArrayPtr.h',
             'PassOwnPtr.h',
             'PassRefPtr.h',
             'PassTraits.h',
-            'Platform.h',
             'PossiblyNull.h',
             'PrintStream.cpp',
             'PrintStream.h',
             'ProcessID.h',
             'RandomNumber.cpp',
             'RandomNumber.h',
             'RandomNumberSeed.h',
             'RefCounted.h',
             'RefCountedLeakCounter.cpp',
             'RefCountedLeakCounter.h',
@@ skipping 124 matching lines @@
             'tests/StringImpl.cpp',
             'tests/StringOperators.cpp',
             'tests/TemporaryChange.cpp',
             'tests/Vector.cpp',
             'tests/VectorBasic.cpp',
             'tests/VectorReverse.cpp',
             'tests/WTFString.cpp',
         ],
     },
 }