Don't pass ProcessHandle through ChildProcessHostDelegate.

base/process/process.h

Index: base/process/process.h
diff --git a/base/process/process.h b/base/process/process.h
index 701947491d7497a29ed2dfac754d0fd96e969083..50ccf8d8e455338bc4b25cf3ec3c1a60d479eef1 100644
--- a/base/process/process.h
+++ b/base/process/process.h
@@ -48,6 +48,12 @@ class BASE_EXPORT Process {
   // Returns an object for the current process.
   static Process Current();
 
+  // Creates an object from a |handle| owned by someone else.
+  // Don't use this for new code. It is only intended to ease the migration to
+  // a strict ownership model.
+  // TODO(rvargas) crbug.com/417532: Remove this code.
+  static Process DeprecatedGetProcessFromHandle(ProcessHandle handle);
+
   // Returns true if processes can be backgrounded.
   static bool CanBackgroundProcesses();