Refactor and fix feedback

chrome/browser/userfeedback/proto/annotations.proto

-// Copyright 2009 Google Inc. All Rights Reserved.
-// Author: micapolos@google.com (Michal Pociecha-Los)
-//
-// Messages containing data about the annotations drawn on the screenshot of a 
-// web page.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package userfeedback;
-
-import "math.proto";
-import "dom.proto";
-
-// An annotation drawn by the user on the screenshot of a web page.
-message Annotation {
-  // A rectangular area covered by this annotation on annotated image.
-  // The (0, 0) coordinate is placed in the top-left corner of the image.
-  // One unit corresponds to one pixel.
-  required Rectangle rectangle = 1;
-
-  // A snippet of text displayed inside annotated portion of a web page.
-  optional string snippet = 2;
-
-  // A path from root element of the document to the annotated element.
-  optional HtmlPath annotatedElementPath = 3;
-};