Reland "Android: Clean up unused Tab methods"

This is a reland of 6b9ae2f7

Speculative revert showed that this CL was not an issue.

Original change's description:
> Android: Clean up unused Tab methods
>
> Now that https://chrome-internal-review.googlesource.com/c/clank/internal/apps/+/813849
> landed, the methods left unused in Tab can be cleaned up.
>
> Bug: 925242
> Change-Id: I64e0d8a6868644ce1843fbc965b6a3fa920d8e11
> Reviewed-on: https://chromium-review.googlesource.com/c/1470285
> Reviewed-by: Ted Choc <tedchoc@chromium.org>
> Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#632406}

TBR=tedchoc@chromium.org

Bug: 925242
Change-Id: I6622ace18a59b0cf370dddcafdcc6e8fb55b4d6b
Reviewed-on: https://chromium-review.googlesource.com/c/1474983Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632760}

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

@@ -128,12 +128,6 @@ public class Tab
 
     private static final long INVALID_TIMESTAMP = -1;
 
-    /**
-     * The required page load percentage for the page to be considered ready assuming the
-     * TextureView is also ready.
-     */
-    private static final int CONSIDERED_READY_LOAD_PERCENTAGE = 100;
-
     /** Used for logging. */
     private static final String TAG = "Tab";
 
@@ -838,15 +832,6 @@ public class Tab
         }
     }
 
-    /**
-     * @return Whether or not the loading and rendering of the page is done.
-     * TODO(jinsukkim): Delete this method once the refactoring is finished.
-     */
-    @VisibleForTesting
-    public boolean isLoadingAndRenderingDone() {
-        return isReady() && getProgress() >= CONSIDERED_READY_LOAD_PERCENTAGE;
-    }
-
     /** Stop the current navigation. */
     public void stopLoading() {
         if (isLoading()) {