Do not use HW H.264 encoder on Nexus 7.

talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java

Index: talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
diff --git a/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java b/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
index eb31cdd16b4bf99560b6222903b5e3d26fc57b17..d85dd3a5dd9c5b89dd2a28b2d464c6b8207e868c 100644
--- a/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
+++ b/talk/app/webrtc/java/src/org/webrtc/MediaCodecVideoEncoder.java
@@ -74,9 +74,10 @@ public class MediaCodecVideoEncoder {
     {"OMX.qcom." };
   // List of devices with poor H.264 encoder quality.
   private static final String[] H264_HW_EXCEPTION_MODELS = new String[] {
-    // HW H.264 encoder on Galaxy S4 generates 2 times lower bitrate comparing
-    // to target.
+    // HW H.264 encoder on below devices has poor bitrate control - actual
+    // bitrates deviates a lot from the target value.
     "SAMSUNG-SGH-I337",
+    "Nexus 7"
   };
 
   // Bitrate modes - should be in sync with OMX_VIDEO_CONTROLRATETYPE defined