Bring download_file, download_manager into POSIX build.

Also shuffle a bunch of headers.

Review URL: http://codereview.chromium.org/27024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10155 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/hash_tables.h b/base/hash_tables.h
index c2d3ddba..0ac2651b 100644
--- a/base/hash_tables.h
+++ b/base/hash_tables.h
@@ -77,7 +77,14 @@
   size_t operator()(const std::string& s) const {
     return std::tr1::hash<std::string>()(s);
   }
-};  
+};
+
+template<>
+struct hash<long long> {
+  size_t operator()(long long i) const {
+    return std::tr1::hash<long>()((long) i);
+  }
+};
 
 }