Make command-zero reset page scale in addition to zoom level

BUG=456880

Review URL: https://codereview.chromium.org/954923005

Cr-Commit-Position: refs/heads/master@{#319658}
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index e56e327c..277afb1 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2453,6 +2453,10 @@
   return maximum_zoom_percent_;
 }
 
+void WebContentsImpl::ResetPageScale() {
+  Send(new ViewMsg_ResetPageScale(GetRoutingID()));
+}
+
 gfx::Size WebContentsImpl::GetPreferredSize() const {
   return capturer_count_ == 0 ? preferred_size_ : preferred_size_for_capture_;
 }