Fix some issues found looking at the code. I have made two posts about it:...

base/base_drop_target.cc

Index: base/base_drop_target.cc
===================================================================
--- base/base_drop_target.cc	(revision 2626)
+++ base/base_drop_target.cc	(working copy)
@@ -14,11 +14,13 @@
 IDropTargetHelper* BaseDropTarget::cached_drop_target_helper_ = NULL;
 
 BaseDropTarget::BaseDropTarget(HWND hwnd)
-    : suspend_(false),
-      ref_count_(0),
-      hwnd_(hwnd) {
+    : current_data_object_(),
+      hwnd_(hwnd),
+      suspend_(false),
+      ref_count_(0) {
   DCHECK(hwnd);
   HRESULT result = RegisterDragDrop(hwnd, this);
+  DCHECK(SUCCEEDED(result));
 }
 
 BaseDropTarget::~BaseDropTarget() {
@@ -130,9 +132,8 @@
 
 ULONG BaseDropTarget::Release() {
   if (InterlockedDecrement(&ref_count_) == 0) {
-    ULONG copied_refcnt = ref_count_;
     delete this;
-    return copied_refcnt;
+    return 0U;
   }
   return ref_count_;
 }