Move //chrome/common/metrics/proto to //chrome/browser/metrics/variations/proto.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 1138d0c55ed52990458eaaaf3a71d398d989bf92..daa5f8d3891741ed0771375a33fbc533783580fe 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -2847,6 +2847,7 @@
         'in_memory_url_index_cache_proto',
         'probe_message_proto',
         'suggestions_proto',
+        'variations_proto',
         '../components/components.gyp:autocomplete',
         '../components/components.gyp:autofill_core_browser',
         '../components/components.gyp:bookmarks_browser',
@@ -3401,6 +3402,21 @@
       ],
     },
     {
+      # Protobuf compiler / generator for UMA (User Metrics Analysis).
+
+      # GN version: //chrome/browser/metrics/variations/proto:proto
+      'target_name': 'variations_proto',
+      'type': 'static_library',
+      'sources': [
+        'browser/metrics/variations/proto/chrome_experiments.proto',
+      ],
+      'variables': {
+        'proto_in_dir': 'browser/metrics/variations/proto',
+        'proto_out_dir': 'chrome/browser/metrics/variations/proto',
+      },
+      'includes': [ '../build/protoc.gypi' ],
+    },
+    {
       # Protobuf compiler / generator for the fraudulent certificate reporting
       # protocol buffer.
       'target_name': 'cert_logger_proto',