Remove getenv for scaling filter as its not needed now and is showing up on profiles.

BUG=228
TESTED=unittest and try bots
Review URL: https://webrtc-codereview.appspot.com/1496004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@696 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 695
+Version: 696
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 695
+#define LIBYUV_VERSION 696
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/scale.cc

@@ -12,7 +12,6 @@
 
 #include <assert.h>
 #include <string.h>
-#include <stdlib.h>  // For getenv()
 
 #include "libyuv/cpu_id.h"
 #include "libyuv/planar_functions.h"  // For CopyPlane
@@ -3313,13 +3312,6 @@ void ScalePlane(const uint8* src, int src_stride,
                 uint8* dst, int dst_stride,
                 int dst_width, int dst_height,
                 FilterMode filtering) {
-#ifdef CPU_X86
-  // environment variable overrides for testing.
-  char* filter_override = getenv("LIBYUV_FILTER");
-  if (filter_override) {
-    filtering = (FilterMode)atoi(filter_override);  // NOLINT
-  }
-#endif
   // Use specialized scales to improve performance for common resolutions.
   // For example, all the 1/2 scalings will use ScalePlaneDown2()
   if (dst_width == src_width && dst_height == src_height) {

source/scale_argb.cc

@@ -12,7 +12,6 @@
 
 #include <assert.h>
 #include <string.h>
-#include <stdlib.h>  // For getenv()
 
 #include "libyuv/cpu_id.h"
 #include "libyuv/planar_functions.h"  // For CopyARGB
@@ -1109,13 +1108,6 @@ static void ScaleARGB(const uint8* src, int src_stride,
     dst += clip_y * dst_stride;
   }
 
-#ifdef CPU_X86
-  // Environment variable overrides for testing.
-  char* filter_override = getenv("LIBYUV_FILTER");
-  if (filter_override) {
-    filtering = (FilterMode)atoi(filter_override);  // NOLINT
-  }
-#endif
   // Special case for integer step values.
   if (((dx | dy) & 0xffff) == 0) {
     // Optimized even scale down. ie 2, 4, 6, 8, 10x.