Introduce ChromeZoomLevelPref, make zoom level prefs independent of profile prefs.

chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc

Index: chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
diff --git a/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc b/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
index a2b05b9f56972f56b9668bd2eea7fa5da7d3f85e..4ae0b4a4160cb1e5793ddd794db938ab27cc714a 100644
--- a/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
+++ b/chrome/browser/ui/webui/constrained_web_dialog_delegate_base.cc
@@ -9,8 +9,10 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/ui/webui/chrome_web_contents_handler.h"
+#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/renderer_preferences.h"
 #include "ipc/ipc_message.h"
 #include "ui/web_dialogs/web_dialog_delegate.h"
 #include "ui/web_dialogs/web_dialog_ui.h"
@@ -38,9 +40,13 @@ ConstrainedWebDialogDelegateBase::ConstrainedWebDialogDelegateBase(
   } else {
     web_contents_->SetDelegate(this);
   }
+  content::RendererPreferences* prefs =
+      web_contents_->GetMutableRendererPrefs();
   renderer_preferences_util::UpdateFromSystemSettings(
-      web_contents_->GetMutableRendererPrefs(),
-      Profile::FromBrowserContext(browser_context));
+      prefs, Profile::FromBrowserContext(browser_context));
+  prefs->default_zoom_level = ZoomController::FromWebContents(
+                                  web_contents_.get())->GetDefaultZoomLevel();

[Bernhard Bauer, 2014/10/01 15:09:14]

Also indent just four spaces w/r/t the previous line here.

[wjmaclean, 2014/10/01 20:33:00]

Done. The style-guide isn't terribly clear in this case, and auto-format has led
me astray here I guess.

+
   web_contents_->GetRenderViewHost()->SyncRendererPrefs();
 
   // Set |this| as a delegate so the ConstrainedWebDialogUI can retrieve it.