Disable WebView/Chrome's drag and drop feature on M and below.

content/browser/web_contents/web_contents_view_android.cc

Index: content/browser/web_contents/web_contents_view_android.cc
diff --git a/content/browser/web_contents/web_contents_view_android.cc b/content/browser/web_contents/web_contents_view_android.cc
index c5a8e50c394792bbc20cff34d5859c6d7806178d..f5b6743af56214a0192f34810a331431cebf7a8a 100644
--- a/content/browser/web_contents/web_contents_view_android.cc
+++ b/content/browser/web_contents/web_contents_view_android.cc
@@ -251,8 +251,12 @@ void WebContentsViewAndroid::StartDragging(
   ScopedJavaLocalRef<jstring> jtext =
       ConvertUTF16ToJavaString(env, drop_data.text.string());
 
-  native_view->StartDragAndDrop(jtext,
-                                gfx::ConvertToJavaBitmap(image.bitmap()));
+  if (!native_view->StartDragAndDrop(
+          jtext, gfx::ConvertToJavaBitmap(image.bitmap()))) {
+    // Need to clear drag and drop state in blink.
+    OnDragEnded();
+    return;
+  }
 
   if (content_view_core_)
     content_view_core_->HidePopupsAndPreserveSelection();