Cleanup: Remove unneeded media/ SSE2 checks and unused code. (try 2)

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index f9f6cfca16e9639774c5819d6846b43e0a897a0a..ff498c746bde8a473aedd9d4f990de59312bccd6 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -977,7 +977,6 @@
         ['target_arch=="ia32" or target_arch=="x64"', {
           'dependencies': [
             'media_asm',
-            'media_mmx',
             'media_sse2',
           ],
           'sources': [
@@ -1413,7 +1412,6 @@
           'type': 'static_library',
           'sources': [
             'base/simd/convert_rgb_to_yuv_ssse3.asm',
-            'base/simd/convert_yuv_to_rgb_mmx.asm',
             'base/simd/convert_yuv_to_rgb_sse.asm',
             'base/simd/convert_yuva_to_argb_mmx.asm',
             'base/simd/empty_register_state_mmx.asm',
@@ -1495,22 +1493,6 @@
           ],
         },
         {
-          'target_name': 'media_mmx',
-          'type': 'static_library',
-          'cflags': [
-            '-mmmx',
-          ],
-          'defines': [
-            'MEDIA_IMPLEMENTATION',
-          ],
-          'include_dirs': [
-            '..',
-          ],
-          'sources': [
-            'base/simd/filter_yuv_mmx.cc',
-          ],
-        },
-        {
           'target_name': 'media_sse2',
           'type': 'static_library',
           'cflags': [