Bug 1336778 - Part 1: Remove always-false #if WINVER < _WIN32_WINNT_WIN7 (0x0601) check in dom/media. r=cpearce

As of bug 1325299, WINVER is always >= 0x0601 (Windows 7).

MozReview-Commit-ID: BJYg9d3zuYx

--HG--
extra : source : 4eff752dd001a722fe1d8e60e56ccb5f70c8d872

dom/media/platforms/wmf/WMF.h

@@ -7,18 +7,6 @@
 #ifndef WMF_H_
 #define WMF_H_
 
-#if WINVER < _WIN32_WINNT_WIN7
-#error \
-You must include WMF.h before including mozilla headers, \
-otherwise mozconfig.h will be included \
-and that sets WINVER to WinXP, \
-which makes Windows Media Foundation unavailable.
-#endif
-
-#pragma push_macro("WINVER")
-#undef WINVER
-#define WINVER _WIN32_WINNT_WIN7
-
 #include <windows.h>
 #include <mfapi.h>
 #include <mfidl.h>
@@ -35,7 +23,7 @@ which makes Windows Media Foundation unavailable.
 #include <codecapi.h>
 
 // The Windows headers helpfully declare min and max macros, which don't
-// compile in the prescence of std::min and std::max and unified builds.
+// compile in the presence of std::min and std::max and unified builds.
 // So undef them here.
 #ifdef min
 #undef min
@@ -97,8 +85,4 @@ HRESULT MFCreateDXGISurfaceBuffer(REFIID riid,
 } // end namespace wmf
 } // end namespace mozilla
 
-
-
-#pragma pop_macro("WINVER")
-
 #endif