Exclude PlatformServiceBridgeImpl from presubmit warning

There are two different implementations of PlatformServiceBridge, both
called PlatformServiceBridgeImpl. (One is downstream.) This CL excludes
the class from the "multiple definitions" presubmit warning.

Bug: 838493
Change-Id: Iaef896f4f04c203497638af01d40f4aaee930919
Reviewed-on: https://chromium-review.googlesource.com/938305Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555225}

PRESUBMIT.py

@@ -588,6 +588,7 @@ _IPC_ENUM_TRAITS_DEPRECATED = (
 _JAVA_MULTIPLE_DEFINITION_EXCLUDED_PATHS = [
     r".*[\\\/]BuildHooksAndroidImpl\.java",
     r".*[\\\/]LicenseContentProvider\.java",
+    r".*[\\\/]PlatformServiceBridgeImpl.java",
 ]
 
 # These paths contain test data and other known invalid JSON files.