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 3ba4ac533cdbb77896836f0a065fa6e8e4383e66..42a6c262056bcde700b0238fcf37fe255b0e7f3d 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;