code: function _stripOldVersionInfo(versionInfo, buildNumber) {
          // Do a simple linear search. Since we are going in reverse-chronological order, we
          // should get through the search quickly.
          var lastIndex = 0;
          var len = versionInfo.length;
          var versionEntry;
          var validBuildEntries;
  
          while (lastIndex < len) {
              versionEntry = versionInfo[lastIndex];
              if (versionEntry.buildNumber <= buildNumber) {
                  break;
              }
              lastIndex++;
          }
  
          if (lastIndex > 0) {
              // Filter recent update entries based on applicability to current platform
              validBuildEntries = versionInfo.slice(0, lastIndex).filter(_checkBuildApplicability);
          }
  
          return validBuildEntries;
      }
docs: Return a new array of version information that is newer than "buildNumber".
  Returns null if there is no new version information.