Create snapshot/mac and move some files from snapshot and util to there

snapshot/mac/process_reader.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef CRASHPAD_UTIL_MAC_PROCESS_READER_H_
-#define CRASHPAD_UTIL_MAC_PROCESS_READER_H_
+#ifndef CRASHPAD_SNAPSHOT_MAC_PROCESS_READER_H_
+#define CRASHPAD_SNAPSHOT_MAC_PROCESS_READER_H_
 
 #include <mach/mach.h>
 #include <sys/sysctl.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <time.h>
 
 #include <string>
 #include <vector>
 
@@ skipping 192 matching lines @@
   bool is_64_bit_;
 
   bool initialized_threads_;
   bool initialized_modules_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessReader);
 };
 
 }  // namespace crashpad
 
-#endif  // CRASHPAD_UTIL_MAC_PROCESS_READER_H_
+#endif  // CRASHPAD_SNAPSHOT_MAC_PROCESS_READER_H_