Revert "Use hide_scrollbars setting for Android WebView."

android_webview/native/aw_settings.cc

Index: android_webview/native/aw_settings.cc
diff --git a/android_webview/native/aw_settings.cc b/android_webview/native/aw_settings.cc
index 3cb71f3941025310049341824a66f55a1930f68d..0b9c46106c8f9b70ef86c121b3f1f90f4e965f91 100644
--- a/android_webview/native/aw_settings.cc
+++ b/android_webview/native/aw_settings.cc
@@ -436,9 +436,6 @@ void AwSettings::PopulateWebPreferencesLocked(JNIEnv* env,
   web_prefs->allow_geolocation_on_insecure_origins =
       Java_AwSettings_getAllowGeolocationOnInsecureOrigins(env, obj);
 
-  // We use system scrollbars, so make Blink's scrollbars invisible.
-  web_prefs->hide_scrollbars = true;
-
   // Keep spellcheck disabled on html elements unless the spellcheck="true"
   // attribute is explicitly specified. This "opt-in" behavior is for backward
   // consistency in apps that use WebView (see crbug.com/652314).