C++11: Use type aliases instead of typedefs

compat/mac/mach-o/getsect.cc

 // 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,
@@ skipping 40 matching lines @@
 // opened, or if the named symbol cannot be found in libmacho.
 void* LookUpSystemLibMachOSymbol(const char* symbol) {
   static void* dl_handle = SystemLibMachOHandle();
   if (!dl_handle) {
     return nullptr;
   }
   return dlsym(dl_handle, symbol);
 }
 
 #ifndef __LP64__
-typedef mach_header MachHeader;
+using MachHeader = mach_header;
 #else
-typedef mach_header_64 MachHeader;
+using MachHeader = mach_header_64;
 #endif
 
-typedef uint8_t*(*GetSectionDataType)(
-    const MachHeader*, const char*, const char*, unsigned long*);
-typedef uint8_t*(*GetSegmentDataType)(
-    const MachHeader*, const char*, unsigned long*);
+using GetSectionDataType =
+    uint8_t*(*)(const MachHeader*, const char*, const char*, unsigned long*);
+using GetSegmentDataType =
+    uint8_t*(*)(const MachHeader*, const char*, unsigned long*);
 
 }  // namespace
 
 extern "C" {
 
 // These implementations look up their functions in libmacho at run time. If
 // the system libmacho provides these functions as it normally does on Mac OS X
 // 10.7 and later, the system’s versions are used directly. Otherwise, the
 // versions in third_party/apple_cctools are used, which are actually just
 // copies of the system’s functions.
@@ skipping 18 matching lines @@
           LookUpSystemLibMachOSymbol("getsegmentdata"));
   if (system_getsegmentdata) {
     return system_getsegmentdata(mhp, segname, size);
   }
   return crashpad_getsegmentdata(mhp, segname, size);
 }
 
 }  // extern "C"
 
 #endif  // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_7