Unncessary 'View source code' option is enabled in context menu of the 'Pdf Viewer' app.

chrome/browser/renderer_context_menu/render_view_context_menu.cc

Index: chrome/browser/renderer_context_menu/render_view_context_menu.cc
diff --git a/chrome/browser/renderer_context_menu/render_view_context_menu.cc b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
index e7b57ee9ec29b050e78c5c5b519e5f7d9eddf515..518f43e790ad9330741928b1fb813786bc75539c 100644
--- a/chrome/browser/renderer_context_menu/render_view_context_menu.cc
+++ b/chrome/browser/renderer_context_menu/render_view_context_menu.cc
@@ -1146,6 +1146,12 @@ bool RenderViewContextMenu::IsCommandIdEnabled(int id) const {
 
     case IDC_VIEW_SOURCE:
     case IDC_CONTENT_CONTEXT_VIEWFRAMESOURCE:
+#if defined(ENABLE_EXTENSIONS)
+      // If we're viewing in a MimeHandlerViewGuest, Source should not be shown.
+      if (extensions::MimeHandlerViewGuest::FromWebContents(

[AKV, 2015/09/05 12:53:09]

Can we use ContextMenuParams MediaType to check whether this is going to be
rendered on a plugin ?

[Deepak, 2015/09/05 12:55:07]

Done.

+          source_web_contents_))
+        return false;
+#endif
       return embedder_web_contents_->GetController().CanViewSource();
 
     case IDC_CONTENT_CONTEXT_INSPECTELEMENT: