Add font_scale_factor_quirk pref.

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 005fc975c495c79374abfbd9c7aa833505fdf9fc..d4ad0d15c2d8b625325c9a08bee56b1c69634f02 100644
--- a/android_webview/native/aw_settings.cc
+++ b/android_webview/native/aw_settings.cc
@@ -198,7 +198,7 @@ void AwSettings::PopulateWebPreferences(WebPreferences* web_prefs) {
 
   int text_size_percent = Java_AwSettings_getTextSizePercentLocked(env, obj);
   if (web_prefs->text_autosizing_enabled) {
-    web_prefs->font_scale_factor = text_size_percent / 100.0f;
+    web_prefs->text_autosizing_font_scale_factor = text_size_percent / 100.0f;
     web_prefs->force_enable_zoom = text_size_percent >= 130;
     // Use the default zoom factor value when Text Autosizer is turned on.
     render_view_host_ext->SetTextZoomFactor(1);