Order function definitions in base/ according to the header.

base/time.h

Index: base/time.h
diff --git a/base/time.h b/base/time.h
index e1fbf965e141e2716210f87f287a89fc98e69afe..ed4e772a13cb403b074fd71dc3dd4bd2327532d8 100644
--- a/base/time.h
+++ b/base/time.h
@@ -411,10 +411,6 @@ class Time {
   int64 us_;
 };
 
-inline Time TimeDelta::operator+(Time t) const {
-  return Time(t.us_ + delta_);
-}
-
 // Inline the TimeDelta factory methods, for fast TimeDelta construction.
 
 // static
@@ -447,6 +443,10 @@ inline TimeDelta TimeDelta::FromMicroseconds(int64 us) {
   return TimeDelta(us);
 }
 
+inline Time TimeDelta::operator+(Time t) const {
+  return Time(t.us_ + delta_);
+}
+
 // TimeTicks ------------------------------------------------------------------
 
 class TimeTicks {