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

content/browser/indexed_db/indexed_db_dispatcher_host.cc

Index: content/browser/indexed_db/indexed_db_dispatcher_host.cc
diff --git a/content/browser/indexed_db/indexed_db_dispatcher_host.cc b/content/browser/indexed_db/indexed_db_dispatcher_host.cc
index ee7070bc6d5a0a7112b75281266591675f2868ef..fc422c4036ae6d041b0e92afa58de2bbf9653504 100644
--- a/content/browser/indexed_db/indexed_db_dispatcher_host.cc
+++ b/content/browser/indexed_db/indexed_db_dispatcher_host.cc
@@ -4,8 +4,6 @@
 
 #include "content/browser/indexed_db/indexed_db_dispatcher_host.h"
 
-#include <vector>
-
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ -529,7 +527,9 @@ void IndexedDBDispatcherHost::DatabaseDispatcherHost::OnPut(
 
   int64 host_transaction_id = parent_->HostTransactionId(params.transaction_id);
   // TODO(alecflett): Avoid a copy here.
-  std::vector<char> value_copy = params.value;
+  std::string value_copy;
+  if (!params.value.empty())
+    value_copy = std::string(&*params.value.begin(), params.value.size());
   connection->database()->Put(
       host_transaction_id,
       params.object_store_id,