IndexedDB: Add histograms for key type

third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp

Index: third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp b/third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp
index 356ad3bbf3b210df2566c89d03bcc990e57753aa..a898a08fb7036990592154ed3a1ec7ffca496903 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp
@@ -83,7 +83,6 @@ int IDBKey::compare(const IDBKey* other) const {
     case NumberType:
       return compareNumbers(m_number, other->m_number);
     case InvalidType:
-    case MinType:
       ASSERT_NOT_REACHED();
       return 0;
   }