Fix lifetime of leveldb::MojoEnv instances.

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 c867b90c99b1397d92be28ec3d1e64489fa3d7b9..df2b64a9cff2617fca9c1e8094e50ce048e3de55 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -119798,7 +119798,7 @@ from previous Chrome versions.
       label="ChromiumWritableFile::SyncParent"/>
   <affected-histogram name="LevelDBEnv.IDB.IOError.BFE"/>
   <affected-histogram name="LevelDBEnv.IOError.BFE"/>
-  <affected-histogram name="LevelDBEnv.LocalStorage.IOError.BFE"/>
+  <affected-histogram name="LevelDBEnv.Mojo.IOError.BFE"/>
   <affected-histogram name="LevelDBEnv.ServiceWorker.IOError.BFE"/>
   <affected-histogram name="WebCore.IndexedDB.LevelDBOpenErrors.BFE"/>
   <affected-histogram name="WebCore.IndexedDB.LevelDBReadErrors.BFE"/>
@@ -119826,8 +119826,8 @@ from previous Chrome versions.
       label="This histogram shows the limit when open failed for reasons
              other than exceeding the limit."/>
   <affected-histogram name="LevelDBEnv.IDB.MaxFDs"/>
-  <affected-histogram name="LevelDBEnv.LocalStorage.MaxFDs"/>
   <affected-histogram name="LevelDBEnv.MaxFDs"/>
+  <affected-histogram name="LevelDBEnv.Mojo.MaxFDs"/>
   <affected-histogram name="LevelDBEnv.ServiceWorker.MaxFDs"/>
 </histogram_suffixes>
 
@@ -119848,8 +119848,8 @@ from previous Chrome versions.
   <suffix name="CreateDir" label="CreateDir"/>
   <affected-histogram name="LevelDBEnv.IDB.RetryRecoveredFromErrorIn"/>
   <affected-histogram name="LevelDBEnv.IDB.TimeUntilSuccessFor"/>
-  <affected-histogram name="LevelDBEnv.LocalStorage.RetryRecoveredFromErrorIn"/>
-  <affected-histogram name="LevelDBEnv.LocalStorage.TimeUntilSuccessFor"/>
+  <affected-histogram name="LevelDBEnv.Mojo.RetryRecoveredFromErrorIn"/>
+  <affected-histogram name="LevelDBEnv.Mojo.TimeUntilSuccessFor"/>
   <affected-histogram name="LevelDBEnv.RetryRecoveredFromErrorIn"/>
   <affected-histogram
       name="LevelDBEnv.ServiceWorker.RetryRecoveredFromErrorIn"/>
@@ -119869,8 +119869,7 @@ from previous Chrome versions.
 
 <histogram_suffixes name="LevelDBEnvTypes" separator="." ordering="prefix">
   <suffix name="IDB" label="Restricted to IndexedDB LevelDB environments"/>
-  <suffix name="LocalStorage"
-      label="Restricted to LocalStorage LevelDB environments"/>
+  <suffix name="Mojo" label="Restricted to Mojo LevelDB environments"/>
   <suffix name="ServiceWorker"
       label="Restricted to ServiceWorker LevelDB environments"/>
   <affected-histogram name="LevelDBEnv.IOError"/>