Rename ui-show-layer-borders to be consistent with other flag.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 52f9a6bfe21b4cb28d55fca4f5483e2b27f2ead8..3466c886a750360eae81cd59c583a6d487a98eb6 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -101721,7 +101721,6 @@ from previous Chrome versions.
   <int value="-1310737697" label="MaterialDesignSettings:enabled"/>
   <int value="-1302904242" label="enable-navigation-tracing"/>
   <int value="-1289678848" label="SystemDownloadManager:enabled"/>
-  <int value="-1289373013" label="ui-show-layer-borders"/>
   <int value="-1285021473" label="save-page-as-mhtml"/>
   <int value="-1276912933" label="enable-quick-unlock-pin"/>
   <int value="-1271563519" label="enable-appcontainer"/>
@@ -101778,6 +101777,7 @@ from previous Chrome versions.
   <int value="-1075089382" label="enable-physical-web"/>
   <int value="-1073479583" label="ShowArcFilesApp:disabled"/>
   <int value="-1067635248" label="SpeculativeResourcePrefetching:disabled"/>
+  <int value="-1064733740" label="ui-show-composited-layer-borders"/>
   <int value="-1062119671" label="enable-password-force-saving"/>
   <int value="-1056310158" label="disable-memory-pressure-chromeos"/>
   <int value="-1052782474" label="enable-cloud-devices"/>