[DevTools] Handle frontend zoom similarly to tab zoom.

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 87acf52c3f42ef8b404ee151571318bd5cbfd81b..09da8598a2e535f1f8c82495fc7ab9f4f3c5e160 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1765,7 +1765,8 @@ void Browser::OnZoomChanged(content::WebContents* source,
                             bool can_show_bubble) {
   if (source == tab_strip_model_->GetActiveWebContents()) {
     // Only show the zoom bubble for zoom changes in the active window.
-    window_->ZoomChangedForActiveTab(can_show_bubble && window_->IsActive());
+    window_->ZoomChangedForActiveTab(can_show_bubble && window_->IsActive() &&
+        !is_devtools());
   }
 }