Bug 1306510 - Disable browser_libraryDrop.js on win10 ccov for almost perma fail. r=jmaher

browser/components/downloads/test/browser/browser.ini

@@ -10,6 +10,7 @@ skip-if = os == "linux" # Bug 952422
 [browser_iframe_gone_mid_download.js]
 [browser_indicatorDrop.js]
 [browser_libraryDrop.js]
+skip-if = (os == 'win' && os_version == '10.0' && ccov) # Bug 1306510
 [browser_library_clearall.js]
 [browser_downloads_panel_block.js]
 skip-if = true # Bug 1352792