Remove unnecessary DCHECK causing unit test failure.

BUG=none
TEST=GoogleUpdateSettings::SetCollectStatsConsent
TBR=cevans

Review URL: http://codereview.chromium.org/6281008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71773 0039d316-1c4b-4281-b951-d872f2087c98

base/win/registry.cc

@@ -219,7 +219,6 @@ GONG RegKey::WriteValue(const wchar_t* name, const void * data,
                         DWORD dsize, DWORD dtype) {
   base::ThreadRestrictions::AssertIOAllowed();
   DCHECK(data);
-  DCHECK(key_);
 
   LONG result = RegSetValueEx(key_, name, 0, dtype,
       reinterpret_cast<LPBYTE>(const_cast<void*>(data)), dsize);