Bug 1767421: Remove use of deprecated GetProcessInformation function. r=mstange

I'm going to assert that we no longer need to worry about someone running
something prior to mozilla 1.3 and so the easiest way to remove this compiler
warning is to just remove this check for the old-style locking entirely.

Differential Revision: https://phabricator.services.mozilla.com/D145321

Author: Mossop

toolkit/profile/nsProfileLock.cpp

@@ -453,48 +453,6 @@ nsresult nsProfileLock::Lock(nsIFile* aProfileDir,
     // assume we tried an NFS that does not support it. Now, try with symlink.
     rv = LockWithSymlink(lockFile, false);
   }
-
-  if (NS_SUCCEEDED(rv)) {
-    // Check for the old-style lock used by pre-mozilla 1.3 builds.
-    // Those builds used an earlier check to prevent the application
-    // from launching if another instance was already running. Because
-    // of that, we don't need to create an old-style lock as well.
-    struct LockProcessInfo {
-      ProcessSerialNumber psn;
-      unsigned long launchDate;
-    };
-
-    PRFileDesc* fd = nullptr;
-    int32_t ioBytes;
-    ProcessInfoRec processInfo;
-    LockProcessInfo lockProcessInfo;
-
-    rv = lockFile->SetLeafName(OLD_LOCKFILE_NAME);
-    if (NS_FAILED(rv)) return rv;
-    rv = lockFile->OpenNSPRFileDesc(PR_RDONLY, 0, &fd);
-    if (NS_SUCCEEDED(rv)) {
-      ioBytes = PR_Read(fd, &lockProcessInfo, sizeof(LockProcessInfo));
-      PR_Close(fd);
-
-      if (ioBytes == sizeof(LockProcessInfo)) {
-#  ifdef __LP64__
-        processInfo.processAppRef = nullptr;
-#  else
-        processInfo.processAppSpec = nullptr;
-#  endif
-        processInfo.processName = nullptr;
-        processInfo.processInfoLength = sizeof(ProcessInfoRec);
-        if (::GetProcessInformation(&lockProcessInfo.psn, &processInfo) ==
-                noErr &&
-            processInfo.processLaunchDate == lockProcessInfo.launchDate) {
-          return NS_ERROR_FILE_ACCESS_DENIED;
-        }
-      } else {
-        NS_WARNING("Could not read lock file - ignoring lock");
-      }
-    }
-    rv = NS_OK;  // Don't propagate error from OpenNSPRFileDesc.
-  }
 #elif defined(XP_UNIX)
   // Get the old lockfile name
   nsCOMPtr<nsIFile> oldLockFile;