Fix Sync.DirectoryOpenResult histogram

sync/syncable/on_disk_directory_backing_store.cc

Index: sync/syncable/on_disk_directory_backing_store.cc
diff --git a/sync/syncable/on_disk_directory_backing_store.cc b/sync/syncable/on_disk_directory_backing_store.cc
index f844f38c4293d2552143b94d1aeba619a582f96f..f0175c17e0e40d1515957089fbd84732ef5c99ef 100644
--- a/sync/syncable/on_disk_directory_backing_store.cc
+++ b/sync/syncable/on_disk_directory_backing_store.cc
@@ -63,7 +63,7 @@ DirOpenResult OnDiskDirectoryBackingStore::Load(
     Directory::KernelLoadInfo* kernel_load_info) {
   DirOpenResult result = TryLoad(entry_bucket, kernel_load_info);
   if (result == OPENED) {
-    HISTOGRAM_ENUMERATION(
+    UMA_HISTOGRAM_ENUMERATION(
         "Sync.DirectoryOpenResult", FIRST_TRY_SUCCESS, RESULT_COUNT);
     return OPENED;
   }
@@ -78,10 +78,10 @@ DirOpenResult OnDiskDirectoryBackingStore::Load(
 
   result = TryLoad(entry_bucket, kernel_load_info);
   if (result == OPENED) {
-    HISTOGRAM_ENUMERATION(
+    UMA_HISTOGRAM_ENUMERATION(
         "Sync.DirectoryOpenResult", SECOND_TRY_SUCCESS, RESULT_COUNT);
   } else {
-    HISTOGRAM_ENUMERATION(
+    UMA_HISTOGRAM_ENUMERATION(
         "Sync.DirectoryOpenResult", SECOND_TRY_FAILURE, RESULT_COUNT);
   }