Stop history search going on beyond the start of history....

chrome/browser/history/visit_database.cc

Index: chrome/browser/history/visit_database.cc
===================================================================
--- chrome/browser/history/visit_database.cc	(revision 11260)
+++ chrome/browser/history/visit_database.cc	(working copy)
@@ -368,4 +368,16 @@
   return true;
 }
 
+bool VisitDatabase::GetStartDate(Time* first_visit) {
+  SQLITE_UNIQUE_STATEMENT(statement, GetStatementCache(),
+      "SELECT MIN(visit_time) FROM visits WHERE visit_time != 0");
+  if (!statement.is_valid() || statement->step() != SQLITE_ROW || 
+      statement->column_int64(0) == 0) {
+    *first_visit = Time::Now();
+    return false;
+  }
+  *first_visit = Time::FromInternalValue(statement->column_int64(0));
+  return true;
+}
+
 }  // namespace history