Remove scoped_memory_log.h from MSVC project files -- it has not existed for some time.

vsprojects/libprotobuf.vcproj

@@ -215,10 +215,6 @@
 				RelativePath="..\src\google\protobuf\repeated_field.h"
 				>
 			</File>
-			<File
-				RelativePath="..\src\google\protobuf\stubs\scoped_memory_log.h"
-				>
-			</File>
 			<File
 				RelativePath="..\src\google\protobuf\service.h"
 				>