Changing multiprocess test SpawnChild to return a struct.

sandbox/mac/sandbox_mac_compiler_v2_unittest.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Foundation/Foundation.h>
 #import <IOSurface/IOSurface.h>
 
 #include <fcntl.h>
 #include <stdint.h>
 #include <sys/mman.h>
@@ skipping 108 matching lines @@
   char oldp[oldp_len];
   EXPECT_EQ(0, sysctlbyname("hw.activecpu", oldp, &oldp_len, NULL, 0));
 
   size_t ncpu_len;
   EXPECT_NE(0, sysctlbyname("hw.ncpu", NULL, &ncpu_len, NULL, 0));
 
   return 0;
 }
 
 TEST_F(SandboxMacCompilerV2Test, V2ProfileTest) {
-  base::Process process = SpawnChild("V2ProfileProcess");
-  ASSERT_TRUE(process.IsValid());
+  base::SpawnChildResult spawn_child = SpawnChild("V2ProfileProcess");
+  ASSERT_TRUE(spawn_child.process.IsValid());
   int exit_code = 42;
-  EXPECT_TRUE(process.WaitForExitWithTimeout(TestTimeouts::action_max_timeout(),
-                                             &exit_code));
+  EXPECT_TRUE(spawn_child.process.WaitForExitWithTimeout(
+      TestTimeouts::action_max_timeout(), &exit_code));
   EXPECT_EQ(exit_code, 0);
 }
 
 }  // namespace sandbox