Fix webvuew vulnerability inside captiveportal activity by disallowing access private file in app's sandbox. Bug: 150610071 Test: Build Change-Id: I67e695478476b6ee9cf21ed41213f25441d9776a
Fix webvuew vulnerability inside captiveportal activity by disallowing access private file in app's sandbox. Bug: 150610071 Test: Build Change-Id: I67e695478476b6ee9cf21ed41213f25441d9776a