Make GlobalDescriptors::MaybeGet return -1 when the key is not found.

chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc

Index: chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc
diff --git a/chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc b/chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc
index 381bb6f0b737d2ce1c0fb438824d9f093ffe6bcf..f0136d50a00d0c0562b93081feae705b2f1aa5c9 100644
--- a/chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc
+++ b/chrome/browser/printing/cloud_print/test/cloud_print_proxy_process_browsertest.cc
@@ -34,6 +34,7 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/test_browser_thread.h"
 #include "ipc/ipc_descriptors.h"
+#include "ipc/ipc_multiprocess_test.h"
 #include "ipc/ipc_switches.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -264,7 +265,7 @@ void SetServiceEnabledExpectations(MockServiceIPCServer* server) {
   server->SetServiceEnabledExpectations();
 }
 
-MULTIPROCESS_TEST_MAIN(CloudPrintMockService_StartEnabledWaitForQuit) {
+MULTIPROCESS_IPC_TEST_MAIN(CloudPrintMockService_StartEnabledWaitForQuit) {
   return CloudPrintMockService_Main(
       base::Bind(&SetServiceEnabledExpectations));
 }
@@ -273,7 +274,7 @@ void SetServiceWillBeDisabledExpectations(MockServiceIPCServer* server) {
   server->SetWillBeDisabledExpectations();
 }
 
-MULTIPROCESS_TEST_MAIN(CloudPrintMockService_StartEnabledExpectDisabled) {
+MULTIPROCESS_IPC_TEST_MAIN(CloudPrintMockService_StartEnabledExpectDisabled) {
   return CloudPrintMockService_Main(
       base::Bind(&SetServiceWillBeDisabledExpectations));
 }