Add Galaxy S4 and Nexus 4 to platform AEC whitelist.

media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java

Index: media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
diff --git a/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java b/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
index 15d7aef6959d78bcd0bd527a16ecbfe7f3051694..0ce12efe4dfc8040afc6c916e8ec60f457deb036 100644
--- a/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
+++ b/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
@@ -384,7 +384,9 @@ class AudioManagerAndroid {
         // quality platform echo cancellation.
         return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN &&
                AcousticEchoCanceler.isAvailable() &&
-               (Build.MODEL.equals("Nexus 5") ||
+               (Build.MODEL.equals("GT-I9500") ||  // Galaxy S4
+                Build.MODEL.equals("Nexus 4") ||
+                Build.MODEL.equals("Nexus 5") ||
                 Build.MODEL.equals("Nexus 7"));
     }