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

base/cpu.h

Index: base/cpu.h
diff --git a/base/cpu.h b/base/cpu.h
index 9567f8b590bb5fb48c4bec6158422187ec2ab7f8..8fad2a92fab87fba90613a8877ee2da9ca5b60e7 100644
--- a/base/cpu.h
+++ b/base/cpu.h
@@ -26,13 +26,13 @@ class BASE_EXPORT CPU {
   int type() const { return type_; }
   int extended_model() const { return ext_model_; }
   int extended_family() const { return ext_family_; }
-  int has_mmx() const { return has_mmx_; }
-  int has_sse() const { return has_sse_; }
-  int has_sse2() const { return has_sse2_; }
-  int has_sse3() const { return has_sse3_; }
-  int has_ssse3() const { return has_ssse3_; }
-  int has_sse41() const { return has_sse41_; }
-  int has_sse42() const { return has_sse42_; }
+  bool has_mmx() const { return has_mmx_; }
+  bool has_sse() const { return has_sse_; }
+  bool has_sse2() const { return has_sse2_; }
+  bool has_sse3() const { return has_sse3_; }
+  bool has_ssse3() const { return has_ssse3_; }
+  bool has_sse41() const { return has_sse41_; }
+  bool has_sse42() const { return has_sse42_; }
 
  private:
   // Query the processor for CPUID information.