Address Dominic's (stylistic) remarks.

src/cycleclock.h

@@ -41,7 +41,7 @@ extern "C" uint64_t __rdtsc();
 #pragma intrinsic(__rdtsc)
 #endif
 
-#if !defined(OS_WINDOWS)
+#ifndef OS_WINDOWS
 #include <sys/time.h>
 #endif
 

src/sysinfo.cc

@@ -305,7 +305,7 @@ static double MyCPUUsageRUsage() {
   user.HighPart = user_time.dwHighDateTime;
   user.LowPart = user_time.dwLowDateTime;
   return (static_cast<double>(kernel.QuadPart) +
-          static_cast<double>(user.QuadPart)) / 1.0E7;
+          static_cast<double>(user.QuadPart)) * 1e-7;
 #endif  // OS_WINDOWS
 }
 

src/walltime.cc

@@ -12,9 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "walltime.h"
 #include "benchmark/macros.h"
 #include "internal_macros.h"
+#include "walltime.h"
 
 #if defined(OS_WINDOWS)
 #include <time.h>
@@ -110,7 +110,7 @@ private:
     ularge.LowPart = file_time.dwLowDateTime;
     ularge.HighPart = file_time.dwHighDateTime;
 
-    tv.tv_sec = (long)((ularge.QuadPart - epoch) / 10000000L);
+    tv.tv_sec = (long)((ularge.QuadPart - epoch) / (10L * 1000 * 1000));
     tv.tv_usec = (long)(system_time.wMilliseconds * 1000);
 #else
     gettimeofday(&tv, nullptr);