MultiProcessTest: Update SpawnChild* to return a Process.

base/memory/shared_memory_unittest.cc

Index: base/memory/shared_memory_unittest.cc
diff --git a/base/memory/shared_memory_unittest.cc b/base/memory/shared_memory_unittest.cc
index 265179afa97e274b30943453c0bd950fb7dd54f9..6e5a4d8f7ee6cdee7c025fc0d048a44a3ba8247d 100644
--- a/base/memory/shared_memory_unittest.cc
+++ b/base/memory/shared_memory_unittest.cc
@@ -699,15 +699,15 @@ const char* const SharedMemoryProcessTest::s_test_name_ = "MPMem";
 TEST_F(SharedMemoryProcessTest, Tasks) {
   SharedMemoryProcessTest::CleanUp();
 
-  ProcessHandle handles[kNumTasks];
+  Process processes[kNumTasks];
   for (int index = 0; index < kNumTasks; ++index) {
-    handles[index] = SpawnChild("SharedMemoryTestMain");
-    ASSERT_TRUE(handles[index]);
+    processes[index] = SpawnChild("SharedMemoryTestMain");
+    ASSERT_TRUE(processes[index].IsValid());
   }
 
   int exit_code = 0;
   for (int index = 0; index < kNumTasks; ++index) {
-    EXPECT_TRUE(WaitForExitCode(handles[index], &exit_code));
+    EXPECT_TRUE(processes[index].WaitForExit(&exit_code));
     EXPECT_EQ(0, exit_code);
   }