Allow public WebViewDatabaseAdapter methods

android_webview/apk/java/proguard.flags

Index: android_webview/apk/java/proguard.flags
diff --git a/android_webview/apk/java/proguard.flags b/android_webview/apk/java/proguard.flags
index 0fc784a2f23e52f26e3188f17de1f370335e944a..ce3afe0a2bde0dcbb11381fde57c9dd60114e389 100644
--- a/android_webview/apk/java/proguard.flags
+++ b/android_webview/apk/java/proguard.flags
@@ -12,6 +12,10 @@
     public *;
 }
 
+-keep class com.android.webview.chromium.WebViewDatabaseAdapter {
+  public *;
+}
+
 # This is the main entry point for APIs. It is kept to make developing with
 # unreleased Android easier.
 -keep class com.android.webview.chromium.WebViewChromium {