The ws2_32.dll is needed by JingleThreadWrapper for WebRTC and Chromoting.

chrome/renderer/chrome_render_process_observer.cc

Index: chrome/renderer/chrome_render_process_observer.cc
===================================================================
--- chrome/renderer/chrome_render_process_observer.cc	(revision 123123)
+++ chrome/renderer/chrome_render_process_observer.cc	(working copy)
@@ -222,6 +222,12 @@
   // Only load this library when the feature is enabled.
   std::string error;
   base::LoadNativeLibrary(FilePath(L"crypt32.dll"), &error);
+  // ws2_32.dll is used by JingleThreadWrapper for WebRTC and Chromoting.
+
+  // TODO(ronghuawu): Remove this once we can get rid of the dependency to
+  // SocketServer (which uses WSACreateEvent) from JingleThreadWrapper.
+  // http://crbug.com/115702
+  base::LoadNativeLibrary(FilePath(L"ws2_32.dll"), &error);
 #endif
 
   // Note that under Linux, the media library will normally already have