diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 330b110..28164cd 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -27,6 +27,7 @@
 
 #include "base/casts.h"
 #include "base/logging.h"
+#include "base/scoped_flock.h"
 #include "base/stl_util.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker-inl.h"
@@ -701,60 +702,6 @@
   return dex_file;
 }
 
-class ScopedFlock {
- public:
-  ScopedFlock() {}
-
-  bool Init(const char* filename, std::string* error_msg) {
-    while (true) {
-      file_.reset(OS::OpenFileWithFlags(filename, O_CREAT | O_RDWR));
-      if (file_.get() == NULL) {
-        *error_msg = StringPrintf("Failed to open file '%s': %s", filename, strerror(errno));
-        return false;
-      }
-      int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_EX));
-      if (flock_result != 0) {
-        *error_msg = StringPrintf("Failed to lock file '%s': %s", filename, strerror(errno));
-        return false;
-      }
-      struct stat fstat_stat;
-      int fstat_result = TEMP_FAILURE_RETRY(fstat(file_->Fd(), &fstat_stat));
-      if (fstat_result != 0) {
-        *error_msg = StringPrintf("Failed to fstat file '%s': %s", filename, strerror(errno));
-        return false;
-      }
-      struct stat stat_stat;
-      int stat_result = TEMP_FAILURE_RETRY(stat(filename, &stat_stat));
-      if (stat_result != 0) {
-        PLOG(WARNING) << "Failed to stat, will retry: " << filename;
-        // ENOENT can happen if someone racing with us unlinks the file we created so just retry.
-        continue;
-      }
-      if (fstat_stat.st_dev != stat_stat.st_dev || fstat_stat.st_ino != stat_stat.st_ino) {
-        LOG(WARNING) << "File changed while locking, will retry: " << filename;
-        continue;
-      }
-      return true;
-    }
-  }
-
-  File& GetFile() {
-    return *file_;
-  }
-
-  ~ScopedFlock() {
-    if (file_.get() != NULL) {
-      int flock_result = TEMP_FAILURE_RETRY(flock(file_->Fd(), LOCK_UN));
-      CHECK_EQ(0, flock_result);
-    }
-  }
-
- private:
-  std::unique_ptr<File> file_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedFlock);
-};
-
 const DexFile* ClassLinker::FindOrCreateOatFileForDexLocation(
     const char* dex_location,
     uint32_t dex_location_checksum,
@@ -785,7 +732,7 @@
 
   // Generate the output oat file for the dex file
   VLOG(class_linker) << "Generating oat file " << oat_location << " for " << dex_location;
-  if (!GenerateOatFile(dex_location, scoped_flock.GetFile().Fd(), oat_location, &error_msg)) {
+  if (!GenerateOatFile(dex_location, scoped_flock.GetFile()->Fd(), oat_location, &error_msg)) {
     CHECK(!error_msg.empty());
     error_msgs->push_back(error_msg);
     return nullptr;