Removal of legacy Firefox driver from .NET bindings

In keeping with the Selenium support policy for versions of Firefox
(current version, immediately previous version, current extended
support release, and immediately previous extended support release),
none of the current supported versions are able to use the legacy,
browser extension-based driver. All supported versions of Firefox now
use geckodriver. To that end, this commit removes the support for use
of the legacy driver from the .NET bindings.

dotnet/src/webdriver/BUCK

@@ -173,12 +173,9 @@ genrule(
 genrule(
   name = 'webdriver_deps',
   srcs = [
-    '//javascript/firefox-driver:webdriver',
     '//javascript/firefox-driver:webdriver_prefs',
     '//javascript/webdriver/atoms:get-attribute',
-    '//javascript/atoms/fragments:is-displayed',
-    '//cpp/prebuilt:noblur32',
-    '//cpp/prebuilt:noblur64'
+    '//javascript/atoms/fragments:is-displayed'
   ],
   bash = 'echo "$SRCS" > $OUT',
   cmd_exe = 'echo "%SRCS%" > %OUT%',