Put the parentheses back where they belong in time_mac.cc. This will allow

Aaron's new test in http://codereview.chromium.org/4471001 to pass.

BUG=49233
TEST=base_unittests Time.FromExplodedWithMilliseconds from
     http://codereview.chromium.org/4471001
Review URL: http://codereview.chromium.org/5042001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66174 0039d316-1c4b-4281-b951-d872f2087c98

base/time_mac.cc

@@ -80,8 +80,8 @@ Time Time::FromExploded(bool is_local, const Exploded& exploded) {
 
 void Time::Explode(bool is_local, Exploded* exploded) const {
   CFAbsoluteTime seconds =
-      (static_cast<double>((us_ - kWindowsEpochDeltaMicroseconds) /
-      kMicrosecondsPerSecond) - kCFAbsoluteTimeIntervalSince1970);
+      ((static_cast<double>(us_) - kWindowsEpochDeltaMicroseconds) /
+      kMicrosecondsPerSecond) - kCFAbsoluteTimeIntervalSince1970;
 
   base::mac::ScopedCFTypeRef<CFTimeZoneRef>
       time_zone(is_local ? CFTimeZoneCopySystem() : NULL);