Ignore viewport meta tags when Request Desktop Site is enabled.

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 acd5356d72e85a4278b6b54130247865c7825dad..aee8af664954bbdcf70cd3bac4665e436e18224d 100644
--- a/android_webview/native/aw_settings.cc
+++ b/android_webview/native/aw_settings.cc
@@ -49,6 +49,7 @@ void PopulateFixedRendererPreferences(RendererPreferences* prefs) {
 void PopulateFixedWebPreferences(WebPreferences* web_prefs) {
   web_prefs->shrinks_standalone_images_to_fit = false;
   web_prefs->should_clear_document_background = false;
+  web_prefs->viewport_meta_enabled = true;
 }
 
 const void* const kAwSettingsUserDataKey = &kAwSettingsUserDataKey;