[WebLayer] Remove deprecated client method

This version of initializeWebViewCompatibilityMode() is no longer used
and can be removed.

Change-Id: I15baa7245a1014562eba0152926f462e0facf2ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202382
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768925}

weblayer/public/java/org/chromium/weblayer/WebLayer.java

@@ -32,7 +32,6 @@ import org.chromium.weblayer_private.interfaces.IWebLayerFactory;
 import org.chromium.weblayer_private.interfaces.ObjectWrapper;
 import org.chromium.weblayer_private.interfaces.StrictModeWorkaround;
 
-import java.io.File;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
@@ -97,15 +96,6 @@ public class WebLayer {
         }
     }
 
-    /** Deprecated. Use initializeWebViewCompatibilityMode(Context) instead. */
-    public static void initializeWebViewCompatibilityMode(@NonNull Context appContext,
-            @NonNull File baseDir, @NonNull Callback<WebViewCompatibilityResult> callback) {
-        WebViewCompatibilityResult result = initializeWebViewCompatibilityMode(appContext);
-        if (callback != null) {
-            callback.onResult(result);
-        }
-    }
-
     /**
      * Performs initialization needed to run WebView and WebLayer in the same process.
      *