Remove runtime CPU detection for SSE optimized media/ methods.

media/base/vector_math.h

Index: media/base/vector_math.h
diff --git a/media/base/vector_math.h b/media/base/vector_math.h
index 0a2cb06f6b9c704f375aa1a5e01c0e93db3ef7f0..a148ca050f1c399c7caa0b772870fb65fcc7d4e5 100644
--- a/media/base/vector_math.h
+++ b/media/base/vector_math.h
@@ -15,11 +15,6 @@ namespace vector_math {
 // Required alignment for inputs and outputs to all vector math functions
 enum { kRequiredAlignment = 16 };
 
-// Selects runtime specific optimizations such as SSE.  Must be called prior to
-// calling FMAC() or FMUL().  Called during media library initialization; most
-// users should never have to call this.
-MEDIA_EXPORT void Initialize();
-
 // Multiply each element of |src| (up to |len|) by |scale| and add to |dest|.
 // |src| and |dest| must be aligned by kRequiredAlignment.
 MEDIA_EXPORT void FMAC(const float src[], float scale, int len, float dest[]);