Remove void** from disk_cache interface.

content/browser/gpu/shader_disk_cache.cc

Index: content/browser/gpu/shader_disk_cache.cc
diff --git a/content/browser/gpu/shader_disk_cache.cc b/content/browser/gpu/shader_disk_cache.cc
index a7f240ce565b8e49ebd4b7c55c87f56db84b1fbb..803a47c68eae886637251e958b9a640c0b67f7ff 100644
--- a/content/browser/gpu/shader_disk_cache.cc
+++ b/content/browser/gpu/shader_disk_cache.cc
@@ -95,7 +95,7 @@ class ShaderDiskReadHelper
 
   base::WeakPtr<ShaderDiskCache> cache_;
   OpType op_type_;
-  void* iter_;
+  disk_cache::Backend::Iterator iter_;
   scoped_refptr<net::IOBufferWithSize> buf_;
   int host_id_;
   disk_cache::Entry* entry_;
@@ -243,7 +243,6 @@ ShaderDiskReadHelper::ShaderDiskReadHelper(
     int host_id)
     : cache_(cache),
       op_type_(OPEN_NEXT),
-      iter_(NULL),
       buf_(NULL),
       host_id_(host_id),
       entry_(NULL) {
@@ -339,8 +338,7 @@ int ShaderDiskReadHelper::ReadComplete(int rv) {
 int ShaderDiskReadHelper::IterationComplete(int rv) {
   DCHECK(CalledOnValidThread());
   // Called through OnOpComplete, so we know |cache_| is valid.
-  cache_->backend()->EndEnumeration(&iter_);
-  iter_ = NULL;
+  iter_.reset();
   op_type_ = TERMINATE;
   return net::OK;
 }