Do not generate a microdump if there are no webview pointers on the stack.

android_webview/crash_reporter/aw_microdump_crash_reporter.cc

Index: android_webview/crash_reporter/aw_microdump_crash_reporter.cc
diff --git a/android_webview/crash_reporter/aw_microdump_crash_reporter.cc b/android_webview/crash_reporter/aw_microdump_crash_reporter.cc
index f8138424080bc10b75c8a4ab5b00b440e5e0efc1..9f507048f2b9d57f5e9829b43b413a52d91285fa 100644
--- a/android_webview/crash_reporter/aw_microdump_crash_reporter.cc
+++ b/android_webview/crash_reporter/aw_microdump_crash_reporter.cc
@@ -154,6 +154,10 @@ void AddGpuFingerprintToMicrodumpCrashHandler(
   breakpad::AddGpuFingerprintToMicrodumpCrashHandler(gpu_fingerprint);
 }
 
+void SetWebViewTextAddrRange(uintptr_t start, uintptr_t end) {
+  breakpad::SetNativeCodeTextAddrRange(start, end);
+}
+
 bool DumpWithoutCrashingToFd(int fd) {
   return g_crash_reporter_client.Pointer()->DumpWithoutCrashingToFd(fd);
 }