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

Source/platform/audio/EqualPowerPanner.cpp

Index: Source/platform/audio/EqualPowerPanner.cpp
diff --git a/Source/platform/audio/EqualPowerPanner.cpp b/Source/platform/audio/EqualPowerPanner.cpp
index ad59c1d409fbadc7a61efcf2a552fbdc7baa2c51..707fe28c28e162f44faa7857f6e3ab98f186b1d1 100644
--- a/Source/platform/audio/EqualPowerPanner.cpp
+++ b/Source/platform/audio/EqualPowerPanner.cpp
@@ -36,8 +36,6 @@
 // Use a 50ms smoothing / de-zippering time-constant.
 const float SmoothingTimeConstant = 0.050f;
 
-using namespace std;
-
 namespace blink {
 
 EqualPowerPanner::EqualPowerPanner(float sampleRate)
@@ -72,8 +70,8 @@ void EqualPowerPanner::pan(double azimuth, double /*elevation*/, const AudioBus*
         return;
 
     // Clamp azimuth to allowed range of -180 -> +180.
-    azimuth = max(-180.0, azimuth);
-    azimuth = min(180.0, azimuth);
+    azimuth = std::max(-180.0, azimuth);
+    azimuth = std::min(180.0, azimuth);
 
     // Alias the azimuth ranges behind us to in front of us:
     // -90 -> -180 to -90 -> 0 and 90 -> 180 to 90 -> 0
@@ -101,8 +99,8 @@ void EqualPowerPanner::pan(double azimuth, double /*elevation*/, const AudioBus*
         }
     }
 
-    desiredGainL = cos(piOverTwoDouble * desiredPanPosition);
-    desiredGainR = sin(piOverTwoDouble * desiredPanPosition);
+    desiredGainL = std::cos(piOverTwoDouble * desiredPanPosition);
+    desiredGainR = std::sin(piOverTwoDouble * desiredPanPosition);
 
     // Don't de-zipper on first render call.
     if (m_isFirstRender) {