Add WebView-specific whitelist for crash keys.

components/crash/content/app/crash_reporter_client.cc

Index: components/crash/content/app/crash_reporter_client.cc
diff --git a/components/crash/content/app/crash_reporter_client.cc b/components/crash/content/app/crash_reporter_client.cc
index fd8834878917f670076d843569e45bed4446ad44..f95708ba10386ca5eb2b93f3dd3bcabef51cee5e 100644
--- a/components/crash/content/app/crash_reporter_client.cc
+++ b/components/crash/content/app/crash_reporter_client.cc
@@ -122,6 +122,11 @@ size_t CrashReporterClient::RegisterCrashKeys() {
   return 0;
 }
 
+std::vector<base::debug::CrashKey>
+CrashReporterClient::GetWhiteListedCrashKeys() {
+  return std::vector<base::debug::CrashKey>();
+}
+
 bool CrashReporterClient::IsRunningUnattended() {
   return true;
 }