Add LINKER_INITIALIZER marker to MemoryMappedFile::Region::kWholeFile

base/files/memory_mapped_file.cc

Index: base/files/memory_mapped_file.cc
diff --git a/base/files/memory_mapped_file.cc b/base/files/memory_mapped_file.cc
index e9656495844212d1fea11c16cabdca9118e1a540..745a5ff1f4524f944823c244249836b6b52bf9a3 100644
--- a/base/files/memory_mapped_file.cc
+++ b/base/files/memory_mapped_file.cc
@@ -10,9 +10,10 @@
 
 namespace base {
 
-const MemoryMappedFile::Region MemoryMappedFile::Region::kWholeFile;
+const MemoryMappedFile::Region MemoryMappedFile::Region::kWholeFile(
+    base::LINKER_INITIALIZED);
 
-MemoryMappedFile::Region::Region() : offset(0), size(0) {
+MemoryMappedFile::Region::Region(base::LinkerInitialized) : offset(0), size(0) {
 }
 
 MemoryMappedFile::Region::Region(int64 offset, int64 size)