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

Source/platform/ThreadTimers.cpp

Index: Source/platform/ThreadTimers.cpp
diff --git a/Source/platform/ThreadTimers.cpp b/Source/platform/ThreadTimers.cpp
index 5be280a25ace2806701005b539162207e6c08029..0cc2ac15b644033a6f2d56c7ae000c1778b37fa6 100644
--- a/Source/platform/ThreadTimers.cpp
+++ b/Source/platform/ThreadTimers.cpp
@@ -35,8 +35,6 @@
 #include "wtf/CurrentTime.h"
 #include "wtf/MainThread.h"
 
-using namespace std;
-
 namespace blink {
 
 // Fire timers for this length of time, and then quit to let the run loop process user input events.
@@ -97,7 +95,7 @@ void ThreadTimers::updateSharedTimer()
                 return;
         }
         m_pendingSharedTimerFireTime = nextFireTime;
-        m_sharedTimer->setFireInterval(max(nextFireTime - currentMonotonicTime, 0.0));
+        m_sharedTimer->setFireInterval(std::max(nextFireTime - currentMonotonicTime, 0.0));
     }
 }