Removing battery API instrumentation

automation/Extension/firefox/data/content.js

@@ -640,9 +640,6 @@ function getPageScript() {
     instrumentObject(window.GainNode.prototype, "GainNode");
     instrumentObject(window.ScriptProcessorNode.prototype, "ScriptProcessorNode");
 
-    // Access to Battery API
-    instrumentObject(window.BatteryManager.prototype, "BatteryManager");
-
     console.log("Successfully started all instrumentation.");
 
   } + "());";

test/test_extension.py

@@ -111,22 +111,6 @@ AUDIO_SYMBOLS = {
     u"OscillatorNode.stop"
 }
 
-# Symbols used during battery fingerprinting
-BATTERY_SYMBOLS = {
-    "window.navigator.getBattery",
-    "BatteryManager.charging",
-    "BatteryManager.level",
-    "BatteryManager.chargingTime",
-    "BatteryManager.dischargingTime",
-    "BatteryManager.addEventListener"
-}
-BATTERY_ARGUMENTS = {
-    '{"0":"chargingtimechange","1":"FUNCTION"}',
-    '{"0":"chargingchange","1":"FUNCTION"}',
-    '{"0":"levelchange","1":"FUNCTION"}',
-    '{"0":"dischargingtimechange","1":"FUNCTION"}'
-}
-
 JS_STACK_TEST_URL = u"%s/js_call_stack.html" % utilities.BASE_TEST_URL
 JS_STACK_TEST_SCRIPT_URL = u"%s/stack.js" % utilities.BASE_TEST_URL
 
@@ -296,20 +280,6 @@ class TestExtension(OpenWPMTest):
             assert (utc_now - js_time).seconds < MAX_TIMEDELTA
         assert not db_utils.any_command_failed(db)
 
-    def test_battery_fingerprinting(self):
-        db = self.visit('/battery_fingerprinting.html')
-        # Check that all calls and methods are recorded
-        rows = db_utils.get_javascript_entries(db)
-        observed_symbols = set()
-        observed_arguments = set()
-        for script_url, symbol, operation, value, args in rows:
-            if symbol == "BatteryManager.addEventListener":
-                observed_arguments.add(args)
-            observed_symbols.add(symbol)
-        assert BATTERY_SYMBOLS == observed_symbols
-        assert BATTERY_ARGUMENTS == observed_arguments
-
-
     def test_document_cookie_instrumentation(self):
         db = self.visit(utilities.BASE_TEST_URL + "/js_cookie.html")
         rows = db_utils.get_javascript_entries(db, all_columns=True)