[Finder] findDirectories() should reject with tried paths
[Finder] findDirectories() should reject with tried paths

On failure, findDirectories() should reject the promise with
an array of paths tried, for consistency with findFiles().

crosswalk-project/DEPRECATED-crosswalk-apk-generator,crosswalk-project/DEPRECATED-crosswalk-apk-generator,crosswalk-project/DEPRECATED-crosswalk-apk-generator,crosswalk-project/DEPRECATED-crosswalk-apk-generator