Clean obsolete android references

i removed the empty obsolete android tests project for dotnet and an old reference to a deleted android source file from webdriver dotnet project.
i cannot test the go compilation but i try to search about it and the android test project appears to be excluded from compilation
note:sorry if my fork have a bad commit history but i'm new to git and i still have same problems to find the clearest way to have my fork sync with the upstream master :)