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

Source/platform/audio/Distance.cpp

Index: Source/platform/audio/Distance.cpp
diff --git a/Source/platform/audio/Distance.cpp b/Source/platform/audio/Distance.cpp
index 8e2c4dcf532d965579e585091c34a78868e54d8c..919371d4480665180599f6d5a4b99cccd3dfbdf7 100644
--- a/Source/platform/audio/Distance.cpp
+++ b/Source/platform/audio/Distance.cpp
@@ -36,8 +36,6 @@
 #include <math.h>
 #include <algorithm>
 
-using namespace std;
-
 namespace blink {
 
 DistanceEffect::DistanceEffect()
@@ -52,11 +50,11 @@ DistanceEffect::DistanceEffect()
 double DistanceEffect::gain(double distance)
 {
     // don't go beyond maximum distance
-    distance = min(distance, m_maxDistance);
+    distance = std::min(distance, m_maxDistance);
 
     // if clamped, don't get closer than reference distance
     if (m_isClamped)
-        distance = max(distance, m_refDistance);
+        distance = std::max(distance, m_refDistance);
 
     switch (m_model) {
     case ModelLinear: