[Mac] Temporarily disable timer coalescing

base/message_loop/message_pump_mac.mm

Index: base/message_loop/message_pump_mac.mm
diff --git a/base/message_loop/message_pump_mac.mm b/base/message_loop/message_pump_mac.mm
index 914977b13d59355e1dd566a6453ea4ae4eb69c78..3cda0962790787e18c36408e7f20a437e74f4aa5 100644
--- a/base/message_loop/message_pump_mac.mm
+++ b/base/message_loop/message_pump_mac.mm
@@ -72,6 +72,9 @@ bool g_not_using_cr_app = false;
 // Call through to CFRunLoopTimerSetTolerance(), which is only available on
 // OS X 10.9.
 void SetTimerTolerance(CFRunLoopTimerRef timer, CFTimeInterval tolerance) {
+// TODO(jeremy): Temporarily disabled in order to gauge net effect of timer
+// coalescing.
+#if 0
   typedef void (*CFRunLoopTimerSetTolerancePtr)(CFRunLoopTimerRef timer,
       CFTimeInterval tolerance);
 
@@ -94,6 +97,7 @@ void SetTimerTolerance(CFRunLoopTimerRef timer, CFTimeInterval tolerance) {
 
   if (settimertolerance_function_ptr)
     settimertolerance_function_ptr(timer, tolerance);
+#endif
 }
 
 }  // namespace