MultiProcessTest: Update SpawnChild* to return a Process.

base/debug/stack_trace_unittest.cc

 // Copyright (c) 2011 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.
 
 #include <limits>
 #include <sstream>
 #include <string>
 
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
@@ skipping 128 matching lines @@
   char* pointer = new char[10];
   delete pointer;
   return 2;
 }
 
 // Regression test for StackDumpingSignalHandler async-signal unsafety.
 // Combined with tcmalloc's debugallocation, that signal handler
 // and e.g. mismatched new[]/delete would cause a hang because
 // of re-entering malloc.
 TEST_F(StackTraceTest, AsyncSignalUnsafeSignalHandlerHang) {
-  ProcessHandle child = SpawnChild("MismatchedMallocChildProcess");
-  ASSERT_NE(kNullProcessHandle, child);
-  ASSERT_TRUE(WaitForSingleProcess(child, TestTimeouts::action_timeout()));
+  Process child = SpawnChild("MismatchedMallocChildProcess");
+  ASSERT_TRUE(child.IsValid());
+  ASSERT_TRUE(WaitForSingleProcess(child.Handle(),
+                                   TestTimeouts::action_timeout()));
 }
 #endif  // !defined(OS_IOS)
 
 namespace {
 
 std::string itoa_r_wrapper(intptr_t i, size_t sz, int base, size_t padding) {
   char buffer[1024];
   CHECK_LE(sz, sizeof(buffer));
 
   char* result = internal::itoa_r(i, buffer, sz, base, padding);
@@ skipping 60 matching lines @@
   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 1));
   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 2));
   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 3));
   EXPECT_EQ("0688", itoa_r_wrapper(0x688, 128, 16, 4));
   EXPECT_EQ("00688", itoa_r_wrapper(0x688, 128, 16, 5));
 }
 #endif  // defined(OS_POSIX) && !defined(OS_ANDROID)
 
 }  // namespace debug
 }  // namespace base