Fix message text for modal prompts when PermissionRequestManager enabled

chrome/browser/permissions/permission_request.h

Index: chrome/browser/permissions/permission_request.h
diff --git a/chrome/browser/permissions/permission_request.h b/chrome/browser/permissions/permission_request.h
index 748313efd9606d90f1ef7a5867d43fe10b98965d..01307e751bc4e555538a20785f04a04b0fdc4f92 100644
--- a/chrome/browser/permissions/permission_request.h
+++ b/chrome/browser/permissions/permission_request.h
@@ -76,6 +76,9 @@ class PermissionRequest {
   // The icon to use next to the message text fragment in the permission bubble.
   virtual IconId GetIconId() const = 0;
 
+  // Returns the full prompt text for this permission.
+  virtual base::string16 GetMessageText() const = 0;
+
   // Returns the shortened prompt text for this permission.  Must be phrased
   // as a heading, e.g. "Location", or "Camera". The permission bubble may
   // coalesce different requests, and if it does, this text will be displayed