IndexedDB: Switch key/value handling from vector<char> to std::string

content/browser/indexed_db/leveldb/leveldb_iterator.h

Index: content/browser/indexed_db/leveldb/leveldb_iterator.h
diff --git a/content/browser/indexed_db/leveldb/leveldb_iterator.h b/content/browser/indexed_db/leveldb/leveldb_iterator.h
index b78747f3524aef9173c4d978d1b2f78f3cf7642a..96cd6b91281d841f0a1fdb32cd089ce309f3825a 100644
--- a/content/browser/indexed_db/leveldb/leveldb_iterator.h
+++ b/content/browser/indexed_db/leveldb/leveldb_iterator.h
@@ -5,7 +5,7 @@
 #ifndef CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_ITERATOR_H_
 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_ITERATOR_H_
 
-#include "content/browser/indexed_db/leveldb/leveldb_slice.h"
+#include "base/strings/string_piece.h"
 
 namespace content {
 
@@ -14,11 +14,11 @@ class LevelDBIterator {
   virtual ~LevelDBIterator() {}
   virtual bool IsValid() const = 0;
   virtual void SeekToLast() = 0;
-  virtual void Seek(const LevelDBSlice& target) = 0;
+  virtual void Seek(const base::StringPiece& target) = 0;
   virtual void Next() = 0;
   virtual void Prev() = 0;
-  virtual LevelDBSlice Key() const = 0;
-  virtual LevelDBSlice Value() const = 0;
+  virtual base::StringPiece Key() const = 0;
+  virtual base::StringPiece Value() const = 0;
 };
 
 }  // namespace content