Gender-neutralize a few more comments / strings.

components/metrics/proto/system_profile.proto

Index: components/metrics/proto/system_profile.proto
diff --git a/components/metrics/proto/system_profile.proto b/components/metrics/proto/system_profile.proto
index 953771b94e4420354090c95ffe03975ec62ad78f..d814b3597fe76c2723396e4aa1616f49ab109866 100644
--- a/components/metrics/proto/system_profile.proto
+++ b/components/metrics/proto/system_profile.proto
@@ -445,7 +445,7 @@ message SystemProfileProto {
     // Total amount of time that the program was running, in seconds,
     // since the last time a log was recorded, as measured using a client-side
     // clock implemented via TimeTicks, which guarantees that it is monotonic
-    // and does not jump if the user changes his/her clock.  The TimeTicks

[Alexei Svitkine (slow), 2016/06/16 06:29:59]

Note: The master copy of this proto lives in google3. Please also send an
internal CL with these changes. Thanks!

[Nico, 2016/06/16 13:50:42]

Thanks for the note. I'm traveling and without corp access this week – can you
do this for me? If not, I'll try to remember when I get back.

[Alexei Svitkine (slow), 2016/06/16 14:05:11]

Sure, done.

+    // and does not jump if the user changes their clock.  The TimeTicks
     // implementation also makes the clock not count time the computer is
     // suspended.
     optional int64 incremental_uptime_sec = 1;
@@ -453,7 +453,7 @@ message SystemProfileProto {
     // Total amount of time that the program was running, in seconds,
     // since startup, as measured using a client-side clock implemented
     // via TimeTicks, which guarantees that it is monotonic and does not
-    // jump if the user changes his/her clock.  The TimeTicks implementation
+    // jump if the user changes their clock.  The TimeTicks implementation
     // also makes the clock not count time the computer is suspended.
     // This field was added for M-35.
     optional int64 uptime_sec = 23;