Componentize IgnoreNavigationResourceThrottle and add chrome and webview specific implementations.

chrome/browser/android/tab_android.h

Index: chrome/browser/android/tab_android.h
diff --git a/chrome/browser/android/tab_android.h b/chrome/browser/android/tab_android.h
index 75bc2ab3d8473e1520f99c5b588efc9fa2c1b78f..5ea1cfaae796610fe2a621651564f50ae8b20b35 100644
--- a/chrome/browser/android/tab_android.h
+++ b/chrome/browser/android/tab_android.h
@@ -19,6 +19,12 @@ namespace browser_sync {
 class SyncedTabDelegate;
 }
 
+namespace chrome {
+namespace android {
+class ChromeWebContentsDelegateAndroid;
+}
+}
+
 namespace content {
 struct ContextMenuParams;
 class WebContents;
@@ -35,6 +41,8 @@ class TabAndroid {
   static TabAndroid* GetNativeTab(JNIEnv* env, jobject obj);
 
   virtual browser_sync::SyncedTabDelegate* GetSyncedTabDelegate() = 0;
+  virtual chrome::android::ChromeWebContentsDelegateAndroid*
+      GetChromeWebContentsDelegateAndroid() const = 0;
 
   int id() const {
     return tab_id_;