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

content/shell/android/linker_test_apk/chromium_linker_test_linker_tests.cc

 // 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.
 
 // This file implements the native methods of
 // org.content.chromium.app.LinkerTests
 // Unlike the content of linker_jni.cc, it is part of the content library and
 // can thus use base/ and the C++ STL.
 
 #include "content/shell/android/linker_test_apk/chromium_linker_test_linker_tests.h"
@@ skipping 61 matching lines @@
   std::vector<MappedMemoryRegion> regions;
   base::debug::ParseProcMaps(maps, &regions);
   if (regions.empty()) {
     LOG(ERROR) << prefix << "FAIL Cannot read memory mappings in this process";
     return false;
   }
 
   const RE2 legacy_linker_re(kLegacyRelroSectionPattern);
   const RE2 modern_linker_re(kModernRelroSectionPattern);
 
-  size_t num_shared_relros = 0;
-  size_t num_bad_shared_relros = 0;
+  int num_shared_relros = 0;
+  int num_bad_shared_relros = 0;
 
   for (size_t n = 0; n < regions.size(); ++n) {
     MappedMemoryRegion& region = regions[n];
 
     const std::string path = region.path;
     const bool is_legacy_relro = re2::RE2::FullMatch(path, legacy_linker_re);
     const bool is_modern_relro = re2::RE2::FullMatch(path, modern_linker_re);
 
     if (is_legacy_relro && is_modern_relro) {
       LOG(ERROR) << prefix
@@ skipping 109 matching lines @@
 
 jboolean CheckForNoSharedRelros(JNIEnv* env,
                                 jclass clazz,
                                 jboolean in_browser_process) {
   return RunChecks(in_browser_process, false);
 }
 
 bool RegisterLinkerTestsJni(JNIEnv* env) { return RegisterNativesImpl(env); }
 
 }  // namespace content