Allow tabCapture API to be granted for chrome:// pages.

chrome/browser/extensions/active_tab_permission_granter.h

Index: chrome/browser/extensions/active_tab_permission_granter.h
diff --git a/chrome/browser/extensions/active_tab_permission_granter.h b/chrome/browser/extensions/active_tab_permission_granter.h
index 8584c29682fa3c25ca308e18e9be31ce57af2c3c..5115bf0eb57a467dde1320184da6b7bbe94cb595 100644
--- a/chrome/browser/extensions/active_tab_permission_granter.h
+++ b/chrome/browser/extensions/active_tab_permission_granter.h
@@ -38,9 +38,9 @@ class ActiveTabPermissionGranter : public content::WebContentsObserver,
   // tab-specific permissions to it until the next page navigation or refresh.
   void GrantIfRequested(const Extension* extension);
 
-  // Returns true if |extension| has been granted tab-specific permissions
-  // for this tab.
-  bool IsGranted(const Extension* extension);
+  // Check if the tab has the kTabs API permission.
+  static bool IsGrantedForTab(const Extension* extension,
+                              const content::WebContents* web_contents);
 
  private:
   // content::WebContentsObserver implementation.