Added histogram on successful check. Safe verification

chrome/browser/webdata/keyword_table.cc

Index: chrome/browser/webdata/keyword_table.cc
diff --git a/chrome/browser/webdata/keyword_table.cc b/chrome/browser/webdata/keyword_table.cc
index b5391948028ed73a6780c7b34ec9bd2b59688082..ee8ef790b79e326816bafaab5483fe7b7d463b0b 100644
--- a/chrome/browser/webdata/keyword_table.cc
+++ b/chrome/browser/webdata/keyword_table.cc
@@ -79,7 +79,7 @@ std::string GetSearchProviderIDSignature(int64 id) {
 // Checks if signature for search provider id is correct and returns the
 // result.
 bool IsSearchProviderIDValid(int64 id, const std::string& signature) {
-  return signature == GetSearchProviderIDSignature(id);
+  return protector::IsSettingValid(base::Int64ToString(id), signature);
 }
 
 }  // anonymous namespace
@@ -289,6 +289,10 @@ bool KeywordTable::DidDefaultSearchProviderChange() {
         protector::kProtectorErrorCount);
     return true;
   }
+  UMA_HISTOGRAM_ENUMERATION(
+      protector::kProtectorHistogramDefaultSearchProvider,
+      protector::kProtectorErrorNoError,
+      protector::kProtectorErrorCount);
   return false;
 }