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..8087a083df6449787842f7d3dd01833ce85ae947 100644
--- a/components/crash/content/app/crash_reporter_client.cc
+++ b/components/crash/content/app/crash_reporter_client.cc
@@ -122,6 +122,14 @@ size_t CrashReporterClient::RegisterCrashKeys() {
   return 0;
 }
 
+bool CrashReporterClient::UseCrashKeysWhiteList() {
+  return false;
+}
+
+std::vector<const char*> CrashReporterClient::GetWhiteListedCrashKeys() {
+  return {};
+}
+
 bool CrashReporterClient::IsRunningUnattended() {
   return true;
 }