Remove duplicate CPU detection code; use base::CPU instead.

remoting/host/differ_block.cc

Index: remoting/host/differ_block.cc
diff --git a/remoting/host/differ_block.cc b/remoting/host/differ_block.cc
index a8da5b92bd270640ec965e416b580632d3378e47..7b7c02d9a0774e9ac408669d81045ad9211d2057 100644
--- a/remoting/host/differ_block.cc
+++ b/remoting/host/differ_block.cc
@@ -4,8 +4,8 @@
 
 #include "remoting/host/differ_block.h"
 
+#include "base/cpu.h"
 #include "build/build_config.h"
-#include "media/base/cpu_features.h"
 #include "remoting/host/differ_block_internal.h"
 
 namespace remoting {
@@ -31,10 +31,11 @@ int BlockDifference(const uint8* image1, const uint8* image2, int stride) {
     // TODO(hclam): Implement a NEON version.
     diff_proc = &BlockDifference_C;
 #else
+    base::CPU cpu;
     // For x86 processors, check if SSE2 is supported.
-    if (media::hasSSE2() && kBlockSize == 32)
+    if (cpu.has_sse2() && kBlockSize == 32)
       diff_proc = &BlockDifference_SSE2_W32;
-    else if (media::hasSSE2() && kBlockSize == 16)
+    else if (cpu.has_sse2() && kBlockSize == 16)
       diff_proc = &BlockDifference_SSE2_W16;
     else
       diff_proc = &BlockDifference_C;