Fix more disabled MSVC warnings, base/ edition.

base/debug/trace_event_synthetic_delay_unittest.cc

Index: base/debug/trace_event_synthetic_delay_unittest.cc
diff --git a/base/debug/trace_event_synthetic_delay_unittest.cc b/base/debug/trace_event_synthetic_delay_unittest.cc
index 7833e7bbcdeb89d47bc2bb404e280cf962f48260..a418eed32e3faceb45d04c8a0bba0ec0d57d8df4 100644
--- a/base/debug/trace_event_synthetic_delay_unittest.cc
+++ b/base/debug/trace_event_synthetic_delay_unittest.cc
@@ -41,19 +41,19 @@ class TraceEventSyntheticDelayTest : public testing::Test,
 
   void AdvanceTime(base::TimeDelta delta) { now_ += delta; }
 
-  int TestFunction() {
+  int64 TestFunction() {
     base::TimeTicks start = Now();
     { TRACE_EVENT_SYNTHETIC_DELAY("test.Delay"); }
     return (Now() - start).InMilliseconds();
   }
 
-  int AsyncTestFunctionBegin() {
+  int64 AsyncTestFunctionBegin() {
     base::TimeTicks start = Now();
     { TRACE_EVENT_SYNTHETIC_DELAY_BEGIN("test.AsyncDelay"); }
     return (Now() - start).InMilliseconds();
   }
 
-  int AsyncTestFunctionEnd() {
+  int64 AsyncTestFunctionEnd() {
     base::TimeTicks start = Now();
     { TRACE_EVENT_SYNTHETIC_DELAY_END("test.AsyncDelay"); }
     return (Now() - start).InMilliseconds();