LeveldbValueStore: Deleting db when open fails due to corruption.

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 f7381fb533a1363732c899e8d97248138a914ac9..6788df48f5916f82f2b561f86002e1bfb47973cd 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -11318,6 +11318,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Extensions.Database.CorruptionRecovery"
+    enum="LevelDBCorruptionRecoveryValue">
+  <owner>cmumford@chromium.org</owner>
+  <summary>
+    The result of an attempt to recover from an attempt to open a database that
+    failed as a result of corruption.
+  </summary>
+</histogram>
+
 <histogram name="Extensions.Database.Open" enum="LevelDBStatus">
   <owner>cmumford@chromium.org</owner>
   <summary>The result of an open attempt to an Extensions database.</summary>
@@ -64476,6 +64485,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="4" label="Bookmark shortcut widget"/>
 </enum>
 
+<enum name="LevelDBCorruptionRecoveryValue" type="int">
+  <int value="0" label="Delete Success"/>
+  <int value="1" label="Delete Failure"/>
+</enum>
+
 <enum name="LevelDBCorruptionTypes" type="int">
   <int value="0" label="other"/>
   <int value="1" label="missing files"/>
@@ -76931,6 +76945,13 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="Stability.ExitFunnel"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="ExtensionsDatabaseCorruptionRecovery" separator=".">
+  <suffix name="Rules" label="Rules backing stores"/>
+  <suffix name="Settings" label="Settings backing stores"/>
+  <suffix name="State" label="State backing stores"/>
+  <affected-histogram name="Extensions.Database.CorruptionRecovery"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="ExtensionsDatabaseOpen" separator=".">
   <suffix name="Rules" label="Rules backing stores"/>
   <suffix name="Settings" label="Settings backing stores"/>