Removing "using" declarations that import names in the C++ Standard library.(Source/platform/audio)

Source/platform/audio/HRTFDatabase.cpp

Index: Source/platform/audio/HRTFDatabase.cpp
diff --git a/Source/platform/audio/HRTFDatabase.cpp b/Source/platform/audio/HRTFDatabase.cpp
index fe9e82dda50a770ec0c1c92b1b493f1990901a66..1815742f45ba3e9944be5c618f51e12a192e0469 100644
--- a/Source/platform/audio/HRTFDatabase.cpp
+++ b/Source/platform/audio/HRTFDatabase.cpp
@@ -32,9 +32,6 @@
 
 #include "platform/audio/HRTFDatabase.h"
 
-
-using namespace std;
-
 namespace blink {
 
 const int HRTFDatabase::MinElevation = -45;
@@ -111,8 +108,8 @@ void HRTFDatabase::getKernelsFromAzimuthElevation(double azimuthBlend, unsigned
 unsigned HRTFDatabase::indexFromElevationAngle(double elevationAngle)
 {
     // Clamp to allowed range.
-    elevationAngle = max(static_cast<double>(MinElevation), elevationAngle);
-    elevationAngle = min(static_cast<double>(MaxElevation), elevationAngle);
+    elevationAngle = std::max(static_cast<double>(MinElevation), elevationAngle);
+    elevationAngle = std::min(static_cast<double>(MaxElevation), elevationAngle);
 
     unsigned elevationIndex = static_cast<int>(InterpolationFactor * (elevationAngle - MinElevation) / RawElevationAngleSpacing);
     return elevationIndex;