[OSL-RV] Renaming RV implementation to OSDropdown (1/2)

Removes the OmniboxSuggestionsDropdown interface.

Bug: 1075602
Change-Id: I87cd6c72581984b6a86403fb4b19b7c81d87d4d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521445Reviewed-by: Tomasz Wiszkowski <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#825850}

chrome/android/java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionsDropdown.java

-// Copyright 2020 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.chrome.browser.omnibox.suggestions;
-
-import android.view.View;
-import android.view.ViewGroup;
-
-import androidx.annotation.Nullable;
-import androidx.annotation.Px;
-
-import org.chromium.chrome.browser.WindowDelegate;
-
-/** Represents the basic functionality of the Omnibox suggestions dropdown. */
-public interface OmniboxSuggestionsDropdown {
-    /** Provides the capabilities required to embed the omnibox suggestion list into the UI. */
-    public interface Embedder {
-        /** Return the anchor view the suggestion list should be drawn below. */
-        View getAnchorView();
-
-        /**
-         * Return the view that the omnibox suggestions should be aligned horizontally to.  The
-         * view must be a descendant of {@link #getAnchorView()}.  If null, the suggestions will
-         * be aligned to the start of {@link #getAnchorView()}.
-         */
-        @Nullable
-        View getAlignmentView();
-
-        /** Return the delegate used to interact with the Window. */
-        WindowDelegate getWindowDelegate();
-
-        /** Return whether the suggestions are being rendered in the tablet UI. */
-        boolean isTablet();
-    }
-
-    /** Interface that will receive notifications and callbacks from OmniboxSuggestionList. */
-    public interface Observer {
-        /**
-         * Invoked whenever the height of suggestion list changes.
-         * The height may change as a result of eg. soft keyboard popping up.
-         *
-         * @param newHeightPx New height of the suggestion list in pixels.
-         */
-        void onSuggestionDropdownHeightChanged(@Px int newHeightPx);
-
-        /**
-         * Invoked whenever the User scrolls the list.
-         */
-        void onSuggestionDropdownScroll();
-
-        /**
-         * Invoked whenever the User scrolls the list to the top.
-         */
-        void onSuggestionDropdownOverscrolledToTop();
-
-        /**
-         * Notify that the user is interacting with an item on the Suggestions list.
-         *
-         * @param isGestureUp Whether user pressed (false) or depressed (true) the element on the
-         *         list.
-         * @param timestamp The timestamp associated with the event.
-         */
-        void onGesture(boolean isGestureUp, long timestamp);
-    }
-
-    /** Get the Android View implementing suggestion list. */
-    ViewGroup getViewGroup();
-
-    /** Show (and properly size) the suggestions list. */
-    void show();
-
-    /** Hide the suggestions list and release any cached resources. */
-    void hide();
-
-    /**
-     * Sets the embedder for the list view.
-     * @param embedder the embedder of this list.
-     */
-    void setEmbedder(Embedder embedder);
-
-    /**
-     * Sets the observer of suggestion list.
-     * @param observer an observer of this list.
-     */
-    void setObserver(Observer observer);
-
-    /** Resets selection typically in response to changes to the list. */
-    void resetSelection();
-
-    /** Update the suggestion popup background to reflect the current state. */
-    void refreshPopupBackground(boolean isIncognito);
-
-    /** @return The number of items in the list. */
-    int getDropdownItemViewCountForTest();
-
-    /** @return The Suggestion view at specific index. */
-    View getDropdownItemViewForTest(int position);
-}