Removing using declarations that import names in the C++ Standard library.

Source/modules/webaudio/AudioScheduledSourceNode.cpp

Index: Source/modules/webaudio/AudioScheduledSourceNode.cpp
diff --git a/Source/modules/webaudio/AudioScheduledSourceNode.cpp b/Source/modules/webaudio/AudioScheduledSourceNode.cpp
index e96f2c89ff98edda428022b0b1bea5ad5402935c..35c3cf915dda820e553b334c2a40956472f1fcbb 100644
--- a/Source/modules/webaudio/AudioScheduledSourceNode.cpp
+++ b/Source/modules/webaudio/AudioScheduledSourceNode.cpp
@@ -36,8 +36,6 @@
 #include <algorithm>
 #include "wtf/MathExtras.h"
 
-using namespace std;
-
 namespace WebCore {
 
 const double AudioScheduledSourceNode::UnknownTime = -1;
@@ -93,7 +91,7 @@ void AudioScheduledSourceNode::updateSchedulingInfo(size_t quantumFrameSize,
     }
 
     quantumFrameOffset = startFrame > quantumStartFrame ? startFrame - quantumStartFrame : 0;
-    quantumFrameOffset = min(quantumFrameOffset, quantumFrameSize); // clamp to valid range
+    quantumFrameOffset = std::min(quantumFrameOffset, quantumFrameSize); // clamp to valid range
     nonSilentFramesToProcess = quantumFrameSize - quantumFrameOffset;
 
     if (!nonSilentFramesToProcess) {
@@ -162,7 +160,7 @@ void AudioScheduledSourceNode::stop(double when, ExceptionState& exceptionState)
         // stop() can be called more than once, with the last call to stop taking effect, unless the
         // source has already stopped due to earlier calls to stop. No exceptions are thrown in any
         // case.
-        when = max(0.0, when);
+        when = std::max(0.0, when);
         m_endTime = when;
     }
 }