Move the SingletonSocket to a temporary directory

base/scoped_temp_dir.h

Index: base/scoped_temp_dir.h
diff --git a/base/scoped_temp_dir.h b/base/scoped_temp_dir.h
index 702c2bc8b6a031b504032be52141f48df4569378..66d52f65163c36ff563ffeedeca8b539ea13d776 100644
--- a/base/scoped_temp_dir.h
+++ b/base/scoped_temp_dir.h
@@ -19,7 +19,7 @@ class ScopedTempDir {
   // No directory is owned/created initially.
   ScopedTempDir();
 
-  // Recursively delete path_
+  // Recursively delete path.
   ~ScopedTempDir();
 
   // Creates a unique directory in TempPath, and takes ownership of it.
@@ -33,6 +33,9 @@ class ScopedTempDir {
   // Don't call multiple times unless Take() has been called first.
   bool Set(const FilePath& path);
 
+  // Deletes the temporary directory wrapped by this object.
+  void Delete();
+
   // Caller takes ownership of the temporary directory so it won't be destroyed
   // when this object goes out of scope.
   FilePath Take();