Make Linker.isUsed() static, and clean up the fallout.

content/shell/android/linker_test_apk/src/org/chromium/chromium_linker_test_apk/LinkerTests.java

 // Copyright 2014 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.chromium_linker_test_apk;
 
 import org.chromium.base.Log;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.library_loader.Linker;
 
 /**
  * A class that is only used in linker test APK to perform runtime checks
  * in the current process.
  */
 @JNINamespace("content")
 public class LinkerTests implements Linker.TestRunner {
     private static final String TAG = "cr.linker_test";
 
     public LinkerTests() {}
 
     @Override
     public boolean runChecks(int memoryDeviceConfig,
                              boolean isBrowserProcess) {
         boolean checkSharedRelro;
         if (isBrowserProcess) {
             Linker linker = Linker.getInstance();
-            int linkerImplementation = linker.getLinkerImplementationForTesting();
+            int linkerImplementation = linker.getImplementationForTesting();
 
             if (linkerImplementation == Linker.LINKER_IMPLEMENTATION_LEGACY) {
                 // LegacyLinker may share RELROs in the browser.
                 switch (Linker.BROWSER_SHARED_RELRO_CONFIG) {
                     case Linker.BROWSER_SHARED_RELRO_CONFIG_NEVER:
                         checkSharedRelro = false;
                         break;
                     case Linker.BROWSER_SHARED_RELRO_CONFIG_LOW_RAM_ONLY:
                         // A shared RELRO should only be used on low-end devices.
                         checkSharedRelro =
@@ skipping 30 matching lines @@
     }
 
     // Check that there are shared RELRO sections in the current process,
     // and that they are properly mapped read-only. Returns true on success.
     private static native boolean nativeCheckForSharedRelros(boolean isBrowserProcess);
 
     // Check that there are no shared RELRO sections in the current process,
     // return true on success.
     private static native boolean nativeCheckForNoSharedRelros(boolean isBrowserProcess);
 }