Change SharedMemory to initialize member vars in header.

base/memory/shared_memory_posix.cc

Index: base/memory/shared_memory_posix.cc
diff --git a/base/memory/shared_memory_posix.cc b/base/memory/shared_memory_posix.cc
index f44e3a27d10e66f0a8f6edee84bfe73854b0a22d..df9fbb7a453d0966ef668bc2aca5e446c536f5d6 100644
--- a/base/memory/shared_memory_posix.cc
+++ b/base/memory/shared_memory_posix.cc
@@ -33,15 +33,10 @@
 
 namespace base {
 
-SharedMemory::SharedMemory()
-    : mapped_size_(0), memory_(NULL), read_only_(false), requested_size_(0) {}
+SharedMemory::SharedMemory() {}
 
 SharedMemory::SharedMemory(const SharedMemoryHandle& handle, bool read_only)
-    : shm_(handle),
-      mapped_size_(0),
-      memory_(NULL),
-      read_only_(read_only),
-      requested_size_(0) {}
+    : shm_(handle), read_only_(read_only) {}
 
 SharedMemory::~SharedMemory() {
   Unmap();