| Index: components/metrics/proto/ukm/source.proto | 
| diff --git a/components/metrics/proto/ukm/source.proto b/components/metrics/proto/ukm/source.proto | 
| index 2fe543e789cf7de52d3bdf6a0da88adb40561ac9..d4a00605a981142aae3815996b08715e7c0171fc 100644 | 
| --- a/components/metrics/proto/ukm/source.proto | 
| +++ b/components/metrics/proto/ukm/source.proto | 
| @@ -12,7 +12,7 @@ option optimize_for = LITE_RUNTIME; | 
| // Next tag: 7 | 
| message Source { | 
| // An identifier for the source. This should be unique within a session. | 
| -  optional int32 id = 1; | 
| +  optional int64 id = 1; | 
|  | 
| // The URL of the source, as recorded in history. If this URL has not been | 
| // discovered by Google's crawler, it should not be recorded. | 
|  |