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..eac090b9cadcfe0017801ae08edfd97346e0b071 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;
+}
+
+const char* const* CrashReporterClient::GetCrashKeyWhiteList() {
+  return nullptr;
+}
+
 bool CrashReporterClient::IsRunningUnattended() {
   return true;
 }