The new predictor still uses LoadingPredictor as an external interface, what do you want to change?

There is code in custom tabs for the prefetch experiment that should be removed, and at any rate WarmupManager should talk to the new predictor, otherwise a number of CCT things will silently stop working.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/843edef8401ecbc1048895d5e40d95d82a404db0

commit 843edef8401ecbc1048895d5e40d95d82a404db0
Author: Benoit Lize <lizeb@chromium.org>
Date: Thu May 17 13:35:05 2018

customtabs: Remove obsolete LoadingPredictor from CustomTabs.

The entry point to the preconnect predictor is in WarmupManager, that
correctly handles both the current and new predictors.

Initialization still needs to be triggered for CustomTabs, as it otherwise
happens after the first page load, which is too late for mayLaunchUrl() to be
effective.

Bug:  817784 
Change-Id: I8dd9a7d41a508954151f7700d2e3fffa9ceb0320
Reviewed-on: https://chromium-review.googlesource.com/1059127
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559509}
[modify] https://crrev.com/843edef8401ecbc1048895d5e40d95d82a404db0/chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java
[modify] https://crrev.com/843edef8401ecbc1048895d5e40d95d82a404db0/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
[delete] https://crrev.com/31f8df48a7c5bcc8050c636ff0fa60b2bcecbf04/chrome/android/java/src/org/chromium/chrome/browser/customtabs/LoadingPredictor.java
[modify] https://crrev.com/843edef8401ecbc1048895d5e40d95d82a404db0/chrome/android/java_sources.gni
[modify] https://crrev.com/843edef8401ecbc1048895d5e40d95d82a404db0/chrome/browser/BUILD.gn
[modify] https://crrev.com/843edef8401ecbc1048895d5e40d95d82a404db0/chrome/browser/android/warmup_manager.cc
[delete] https://crrev.com/31f8df48a7c5bcc8050c636ff0fa60b2bcecbf04/chrome/browser/predictors/loading_predictor_android.cc