[Telemetry] Resolve errors due to new pylint checker.

tools/telemetry/telemetry/core/browser_finder_exceptions.py

Index: tools/telemetry/telemetry/core/browser_finder_exceptions.py
diff --git a/third_party/ashmem/BUILD.gn b/tools/telemetry/telemetry/core/browser_finder_exceptions.py
similarity index 61%
copy from third_party/ashmem/BUILD.gn
copy to tools/telemetry/telemetry/core/browser_finder_exceptions.py
index a3f7e6a28657131501024ba45b28627ae0893fff..76fbdcf69016ea090b44031f4ff843ba837ade65 100644
--- a/third_party/ashmem/BUILD.gn
+++ b/tools/telemetry/telemetry/core/browser_finder_exceptions.py
@@ -2,11 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-assert(is_android)
-
-source_set("ashmem") {
-  sources = [
-    "ashmem.h",
-    "ashmem-dev.c",
-  ]
-}
+
+class BrowserTypeRequiredException(Exception):
+  pass
+
+
+class BrowserFinderException(Exception):
+  pass