MultiProcessTest: Update SpawnChild* to return a Process.

content/common/sandbox_mac_diraccess_unittest.mm

Index: content/common/sandbox_mac_diraccess_unittest.mm
diff --git a/content/common/sandbox_mac_diraccess_unittest.mm b/content/common/sandbox_mac_diraccess_unittest.mm
index 7a3fed8dfbc73c63d3e0d0e73724ac19c2e21e90..a403ecd25634fa6847423c04df67b1c5ce830335 100644
--- a/content/common/sandbox_mac_diraccess_unittest.mm
+++ b/content/common/sandbox_mac_diraccess_unittest.mm
@@ -34,14 +34,14 @@ class MacDirAccessSandboxTest : public base::MultiProcessTest {
  public:
   bool CheckSandbox(const std::string& directory_to_try) {
     setenv(kSandboxAccessPathKey, directory_to_try.c_str(), 1);
-    base::ProcessHandle child_process = SpawnChild("mac_sandbox_path_access");
-    if (child_process == base::kNullProcessHandle) {
+    base::Process child_process = SpawnChild("mac_sandbox_path_access");
+    if (!child_process.IsValid()) {
       LOG(WARNING) << "SpawnChild failed";
       return false;
     }
     int code = -1;
-    if (!base::WaitForExitCode(child_process, &code)) {
-      LOG(WARNING) << "base::WaitForExitCode failed";
+    if (!child_process.WaitForExit(&code)) {
+      LOG(WARNING) << "Process::WaitForExit failed";
       return false;
     }
     return code == 0;