Add a convenience typedef LazyInstance<T>::Leaky to avoid repeating T.

printing/pdf_metafile_cg_mac.cc

 // Copyright (c) 2011 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.
 
 #include "printing/pdf_metafile_cg_mac.h"
 
 #include "base/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
@@ skipping 17 matching lines @@
 // is used to hold the destination context, and then about five layers down on
 // the callstack, a PdfMetafileCg is used to hold the source PDF. If the source
 // PDF is drawn into the destination PDF context and then released, accessing
 // the destination PDF context will crash. So the outermost instantiation of
 // PdfMetafileCg creates a pool for deeper instantiations to dump their used
 // PDFs into rather than releasing them. When the top-level PDF is closed, then
 // it's safe to clear the pool. A thread local is used to allow this to work in
 // single-process mode. TODO(avi): This Apple bug appears fixed in 10.7; when
 // 10.7 is the minimum required version for Chromium, remove this hack.
 
-base::LazyInstance<
-    base::ThreadLocalPointer<struct __CFSet>,
-    base::LeakyLazyInstanceTraits<base::ThreadLocalPointer<struct __CFSet> > >
-        thread_pdf_docs = LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<base::ThreadLocalPointer<struct __CFSet> >::Leaky
+    thread_pdf_docs = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 namespace printing {
 
 PdfMetafileCg::PdfMetafileCg()
     : page_is_open_(false),
       thread_pdf_docs_owned_(false) {
   if (!thread_pdf_docs.Pointer()->Get() &&
       base::mac::IsOSSnowLeopardOrEarlier()) {
@@ skipping 239 matching lines @@
 
   if (!pdf_doc_.get()) {
     ScopedCFTypeRef<CGDataProviderRef> pdf_data_provider(
         CGDataProviderCreateWithCFData(pdf_data_));
     pdf_doc_.reset(CGPDFDocumentCreateWithProvider(pdf_data_provider));
   }
   return pdf_doc_.get();
 }
 
 }  // namespace printing