Break TYPE_PC into TYPE_WIN, TYPE_MAC, TYPE_LINUX.

chrome/browser/sync/protocol/session_specifics.proto

Index: chrome/browser/sync/protocol/session_specifics.proto
diff --git a/chrome/browser/sync/protocol/session_specifics.proto b/chrome/browser/sync/protocol/session_specifics.proto
index 001b0516ed418b547e6244d9dfaf2c2e16fcfc54..a4a94b3dba027c1ef27cb2c188b18ee6af685845 100644
--- a/chrome/browser/sync/protocol/session_specifics.proto
+++ b/chrome/browser/sync/protocol/session_specifics.proto
@@ -30,8 +30,11 @@ message SessionHeader {
   optional string client_name = 3;
   // The type of device.
   enum DeviceType {
-    TYPE_PC = 1;
-    TYPE_CROS = 2;
+    TYPE_WIN = 1;
+    TYPE_MAC = 2;
+    TYPE_LINUX = 3;
+    TYPE_CROS = 4;
+    TYPE_OTHER = 5;

[ncarter (slow), 2011/08/30 21:52:30]

Why do the dangerous renumbering?

[Yaron, 2011/08/30 21:58:46]

This field was just added and has never been used anywhere. There's no code yet
that reads/writes it.

[ncarter (slow), 2011/08/30 21:59:49]

OK.

   }
   optional DeviceType device_type = 4;
 }