Update includes of mojo/edk to be fully-qualified instead of relative to third_party/mojo/src.

third_party/mojo/src/mojo/edk/system/process_identifier.h

Index: third_party/mojo/src/mojo/edk/system/process_identifier.h
diff --git a/third_party/mojo/src/mojo/edk/system/process_identifier.h b/third_party/mojo/src/mojo/edk/system/process_identifier.h
index 73ed3351b4499649a821604d6421942dbc46a858..dd1157a795a40dc60bc81b5950106ecf11b54b58 100644
--- a/third_party/mojo/src/mojo/edk/system/process_identifier.h
+++ b/third_party/mojo/src/mojo/edk/system/process_identifier.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MOJO_EDK_SYSTEM_PROCESS_IDENTIFIER_H_
-#define MOJO_EDK_SYSTEM_PROCESS_IDENTIFIER_H_
+#ifndef THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_PROCESS_IDENTIFIER_H_
+#define THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_PROCESS_IDENTIFIER_H_
 
 #include <stdint.h>
 
@@ -22,4 +22,4 @@ const ProcessIdentifier kMasterProcessIdentifier = 1;
 }  // namespace system
 }  // namespace mojo
 
-#endif  // MOJO_EDK_SYSTEM_PROCESS_IDENTIFIER_H_
+#endif  // THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_PROCESS_IDENTIFIER_H_