diff --git a/content/media/webaudio/blink/Biquad.cpp b/content/media/webaudio/blink/Biquad.cpp
index 45776bf4609f..5ed1432f65b8 100644
--- a/content/media/webaudio/blink/Biquad.cpp
+++ b/content/media/webaudio/blink/Biquad.cpp
@@ -86,7 +86,7 @@ void Biquad::process(const float* sourceP, float* destP, size_t framesToProcess)
       // Flush future values to zero (until there is new input).
       y1 = y2 = 0.0;
       // Flush calculated values.
-      for (int i = framesToProcess; i-- && fabs(destP[i]) < FLT_MIN; ) {
+      for (int i = framesToProcess; i-- && fabsf(destP[i]) < FLT_MIN; ) {
         destP[i] = 0.0f;
       }
     }
diff --git a/content/media/webaudio/blink/ZeroPole.cpp b/content/media/webaudio/blink/ZeroPole.cpp
index 02879f981e85..ac0b15c7adc1 100644
--- a/content/media/webaudio/blink/ZeroPole.cpp
+++ b/content/media/webaudio/blink/ZeroPole.cpp
@@ -28,11 +28,12 @@
 
 #include "ZeroPole.h"
 
-#include "DenormalDisabler.h"
+#include <cmath>
+#include <float.h>
 
 namespace WebCore {
 
-void ZeroPole::process(const float *source, float *destination, unsigned framesToProcess)
+void ZeroPole::process(const float *source, float *destination, int framesToProcess)
 {
     float zero = m_zero;
     float pole = m_pole;
@@ -45,8 +46,8 @@ void ZeroPole::process(const float *source, float *destination, unsigned framesT
     float lastX = m_lastX;
     float lastY = m_lastY;
 
-    while (framesToProcess--) {
-        float input = *source++;
+    for (int i = 0; i < framesToProcess; ++i) {
+        float input = source[i];
 
         // Zero
         float output1 = k1 * (input - zero * lastX);
@@ -56,13 +57,22 @@ void ZeroPole::process(const float *source, float *destination, unsigned framesT
         float output2 = k2 * output1 + pole * lastY;
         lastY = output2;
 
-        *destination++ = output2;
+        destination[i] = output2;
     }
     
     // Locals to member variables. Flush denormals here so we don't
     // slow down the inner loop above.
-    m_lastX = DenormalDisabler::flushDenormalFloatToZero(lastX);
-    m_lastY = DenormalDisabler::flushDenormalFloatToZero(lastY);
+    if (lastX == 0.0f && lastY != 0.0f && fabsf(lastY) < FLT_MIN) {
+        // Flush future values to zero (until there is new input).
+        lastY = 0.0;
+        // Flush calculated values.
+        for (int i = framesToProcess; i-- && fabsf(destination[i]) < FLT_MIN; ) {
+            destination[i] = 0.0f;
+        }
+    }
+
+    m_lastX = lastX;
+    m_lastY = lastY;
 }
 
 } // namespace WebCore
diff --git a/content/media/webaudio/blink/ZeroPole.h b/content/media/webaudio/blink/ZeroPole.h
index 4cb1d174563f..7381bde3d2ef 100644
--- a/content/media/webaudio/blink/ZeroPole.h
+++ b/content/media/webaudio/blink/ZeroPole.h
@@ -43,7 +43,7 @@ public:
     {
     }
 
-    void process(const float *source, float *destination, unsigned framesToProcess);
+    void process(const float *source, float *destination, int framesToProcess);
 
     // Reset filter state.
     void reset() { m_lastX = 0; m_lastY = 0; }