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

chrome/browser/safe_browsing/safe_browsing_blocking_page.cc

Index: chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc b/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
index b859f7343d24e682fb2807aaf19a8e5772a9faf5..1e7d2c9ae289d2641158f2db67cb0b5bff845756 100644
--- a/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_blocking_page.cc
@@ -35,10 +35,12 @@
 #include "chrome/grit/locale_settings.h"
 #include "components/google/core/browser/google_util.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/interstitial_page.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/renderer_preferences.h"
 #include "grit/browser_resources.h"
 #include "net/base/escape.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -448,6 +450,10 @@ void SafeBrowsingBlockingPage::OverrideRendererPrefs(
   Profile* profile = Profile::FromBrowserContext(
       web_contents_->GetBrowserContext());
   renderer_preferences_util::UpdateFromSystemSettings(prefs, profile);
+  // TODO(wjmaclean): Convert this to use the HostZoomMap for the WebContents
+  // when HostZoomMap moves to StoragePartition.
+  prefs->default_zoom_level = content::HostZoomMap::GetDefaultForBrowserContext(
+                                  profile)->GetDefaultZoomLevel();
  }
 
 void SafeBrowsingBlockingPage::SetReportingPreference(bool report) {