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/1470285Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632406}

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";
 
@@ -834,15 +828,6 @@ 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()) {