Componentize IgnoreNavigationResourceThrottle and add chrome and webview specific implementations.

chrome/browser/android/chrome_web_contents_delegate_android.h

Index: chrome/browser/android/chrome_web_contents_delegate_android.h
diff --git a/chrome/browser/android/chrome_web_contents_delegate_android.h b/chrome/browser/android/chrome_web_contents_delegate_android.h
index dea38f835bf7e202d5793815e27f640838bf92d8..22aefb00d31512c056cfcc0fb8ba9f00ff7be203 100644
--- a/chrome/browser/android/chrome_web_contents_delegate_android.h
+++ b/chrome/browser/android/chrome_web_contents_delegate_android.h
@@ -12,6 +12,7 @@
 #include "content/public/browser/notification_registrar.h"
 
 class FindNotificationDetails;
+class GURL;
 
 namespace content {
 struct FileChooserParams;
@@ -50,6 +51,8 @@ class ChromeWebContentsDelegateAndroid
                                    int version,
                                    const std::vector<gfx::RectF>& rects,
                                    const gfx::RectF& active_rect) OVERRIDE;
+  virtual bool ShouldIgnoreNavigation(const GURL& url,
+                                      bool is_content_initiated);
 
  private:
   // NotificationObserver implementation.