Revert of Improved x86 SSE build and run-time checks.

include/core/SkPreConfig.h

Index: include/core/SkPreConfig.h
diff --git a/include/core/SkPreConfig.h b/include/core/SkPreConfig.h
index a15f8ecf225e20911676ecb6ee6b1c7d694aaeb9..9aefc2d64a6abcd4fc3ffae86896eaa89a5039ea 100644
--- a/include/core/SkPreConfig.h
+++ b/include/core/SkPreConfig.h
@@ -123,18 +123,12 @@
 #define SK_CPU_SSE_LEVEL_SSE2     20
 #define SK_CPU_SSE_LEVEL_SSE3     30
 #define SK_CPU_SSE_LEVEL_SSSE3    31
-#define SK_CPU_SSE_LEVEL_SSE41    41
-#define SK_CPU_SSE_LEVEL_SSE42    42
 
 // Are we in GCC?
 #ifndef SK_CPU_SSE_LEVEL
     // These checks must be done in descending order to ensure we set the highest
     // available SSE level.
-    #if defined(__SSE4_2__)
-        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE42
-    #elif defined(__SSE4_1__)
-        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE41
-    #elif defined(__SSSE3__)
+    #if defined(__SSSE3__)
         #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSSE3
     #elif defined(__SSE3__)
         #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE3