Clarified description of the timezone policy.

chrome/browser/policy/proto/chrome_device_policy.proto

Index: chrome/browser/policy/proto/chrome_device_policy.proto
diff --git a/chrome/browser/policy/proto/chrome_device_policy.proto b/chrome/browser/policy/proto/chrome_device_policy.proto
index 262e85eec4db62e1e7715f0339f04c5dfd5f3dac..04cb8cdd2a013592735061803df82f5bd6df2870 100644
--- a/chrome/browser/policy/proto/chrome_device_policy.proto
+++ b/chrome/browser/policy/proto/chrome_device_policy.proto
@@ -207,10 +207,13 @@ message StartUpUrlsProto {
 }
 
 message SystemTimezoneProto {
-  // Specifies the timezone which is applied if this value is provided. Valid
-  // values are listed in "timezone_settings.cc". Additionally, timezones from
+  // The timezone policy is active if this value is provided. Valid values are
+  // listed in "timezone_settings.cc". Additionally, timezones from

[Mattias Nissler (ping if slow), 2012/08/21 08:48:20]

Re-flow to use all 80 columns.

[pneubeck (no reviews), 2012/08/21 09:02:10]

Done.

   // the "IANA Time Zone Database" (e.g. listed on wikipedia) that are
   // equivalent to one of the timezones in "timezone_settings.cc" are valid.
+  // In case of an invalid value, the policy is still activated with a fallback
+  // timezone (currently "GMT").
+  // Only if no value is provided, the timezone policy is inactive.

[Mattias Nissler (ping if slow), 2012/08/21 08:48:20]

Please describe what "inactive" means.

[pneubeck (no reviews), 2012/08/21 09:02:10]

Done.

   optional string timezone = 1;
 }