Add some |using mojo::...;|s to //shell .cc files.

shell/shell_test_base_unittest.cc

Index: shell/shell_test_base_unittest.cc
diff --git a/shell/shell_test_base_unittest.cc b/shell/shell_test_base_unittest.cc
index cc39cb5366cdcd016ae592fe688ade19de3a1f71..03d047df4fc6ea2081fc92638eb15bf0a42dda56 100644
--- a/shell/shell_test_base_unittest.cc
+++ b/shell/shell_test_base_unittest.cc
@@ -17,6 +17,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
+using mojo::Callback;
 using mojo::test::ServiceReport;
 using mojo::test::ServiceReportPtr;
 using mojo::test::TestService;
@@ -243,11 +244,11 @@ TEST_F(ShellTestBaseTest, ConnectServiceAsClientOfSeparateApp) {
   TestServicePtr service;
   ConnectToService(test_app_url(), &service);
   service->StartTrackingRequests(message_loop()->QuitWhenIdleClosure());
-  service->Ping(mojo::Callback<void()>());
+  service->Ping(Callback<void()>());
   message_loop()->Run();
 
   for (int i = 0; i < 8; i++)
-    service->Ping(mojo::Callback<void()>());
+    service->Ping(Callback<void()>());
   service->Ping(message_loop()->QuitWhenIdleClosure());
   message_loop()->Run();
 
@@ -273,7 +274,7 @@ TEST_F(ShellTestBaseTest, ConnectManyClientsAndServices) {
   service->StartTrackingRequests(message_loop()->QuitWhenIdleClosure());
   message_loop()->Run();
   for (int i = 0; i < 5; i++)
-    service->Ping(mojo::Callback<void()>());
+    service->Ping(Callback<void()>());
   int64 time_result;
   service->ConnectToAppAndGetTime("mojo:test_request_tracker_app",
                                   SetAndQuit<int64>(&time_result));
@@ -282,10 +283,10 @@ TEST_F(ShellTestBaseTest, ConnectManyClientsAndServices) {
   // Also make a few requests to the TimeService in the test_app.
   ConnectToService(test_app_url(), &time_service);
   time_service->StartTrackingRequests(message_loop()->QuitWhenIdleClosure());
-  time_service->GetPartyTime(mojo::Callback<void(uint64_t)>());
+  time_service->GetPartyTime(Callback<void(uint64_t)>());
   message_loop()->Run();
   for (int i = 0; i < 18; i++)
-    time_service->GetPartyTime(mojo::Callback<void(uint64_t)>());
+    time_service->GetPartyTime(Callback<void(uint64_t)>());
   // Flush the tasks with one more to quit.
   int64 party_time = 0;
   time_service->GetPartyTime(SetAndQuit<int64>(&party_time));