Make class lookup lazy in jni_generator when using lazy method lookup.

android_webview/lib/main/webview_entry_point.cc

Index: android_webview/lib/main/webview_entry_point.cc
diff --git a/android_webview/lib/main/webview_entry_point.cc b/android_webview/lib/main/webview_entry_point.cc
index 1aa1d27b385fecfe07930bd22548c05b362acac2..34b8ff40d85fce5d4388d8126660aad7e0e5eb7b 100644
--- a/android_webview/lib/main/webview_entry_point.cc
+++ b/android_webview/lib/main/webview_entry_point.cc
@@ -47,6 +47,8 @@ JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   if (!android_webview::RegisterJni(env))
     return -1;
 
+  base::android::InitFallbackClassLoader(env);
+
   content::SetContentMainDelegate(new android_webview::AwMainDelegate());
 
   // Initialize url lib here while we are still single-threaded, in case we use