[Telemetry + tools/perf] Modify the pylint disable message to use symbolic name

tools/telemetry/telemetry/page/page_test.py

Index: tools/telemetry/telemetry/page/page_test.py
diff --git a/tools/telemetry/telemetry/page/page_test.py b/tools/telemetry/telemetry/page/page_test.py
index 5d267867bd2035eac30c61204b2a53568fcb5700..bb2e5cedc9534a972d810b4f2667e3d7a4fc2ffe 100644
--- a/tools/telemetry/telemetry/page/page_test.py
+++ b/tools/telemetry/telemetry/page/page_test.py
@@ -90,7 +90,7 @@ class PageTest(object):
     """
     return self._needs_browser_restart_after_each_page
 
-  def StopBrowserAfterPage(self, browser, page):  # pylint: disable=W0613
+  def StopBrowserAfterPage(self, browser, page):
     """Should the browser be stopped after the page is run?
 
     This is called after a page is run to decide whether the browser needs to
@@ -100,6 +100,7 @@ class PageTest(object):
     A test that overrides this can look at both the page and the browser to
     decide whether it needs to stop the browser.
     """
+    del browser, page  # unused
     return False
 
   def CustomizeBrowserOptions(self, options):
@@ -129,7 +130,7 @@ class PageTest(object):
   def DidRunPage(self, platform):
     """Called after the test run method was run, even if it failed."""
 
-  def TabForPage(self, page, browser):   # pylint: disable=W0613
+  def TabForPage(self, page, browser):   # pylint: disable=unused-argument
     """Override to select a different tab for the page.  For instance, to
     create a new tab for every page, return browser.tabs.New()."""
     try: