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..6f836cdea6d9bb11b4e96432c2f1f6834995f6fa 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 +1146,11 @@ bool RenderViewContextMenu::IsCommandIdEnabled(int id) const {
 
     case IDC_VIEW_SOURCE:
     case IDC_CONTENT_CONTEXT_VIEWFRAMESOURCE:
+      // If we're viewing in a MimeHandlerViewGuest source should not be shown.

[AKV, 2015/09/05 11:15:32]

Please protect it using ENABLE_EXTENSIONS flag.

[Deepak, 2015/09/05 11:52:14]

Done.

+      if (extensions::MimeHandlerViewGuest::FromWebContents(
+              source_web_contents_)) {

[AKV, 2015/09/05 11:15:32]

Please indent to 4 spaces instead of 8

[Deepak, 2015/09/05 11:52:14]

Done.

+        return false;

[AKV, 2015/09/05 11:15:32]

nit: single line body block doesn't need braces.

[Deepak, 2015/09/05 11:52:14]

Done.

+      }
       return embedder_web_contents_->GetController().CanViewSource();
 
     case IDC_CONTENT_CONTEXT_INSPECTELEMENT: