Handle platforms with no bluetooth in AudioManagerAndroid.

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 8005ddcb58caafec7e5a1f6f749e00c95e30ebf5..cb03a56b74aa77268ed2c2d8a0cc3f1eb0ce2d04 100644
--- a/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
+++ b/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
@@ -664,6 +664,11 @@ class AudioManagerAndroid {
             btAdapter = BluetoothAdapter.getDefaultAdapter();
         }
 
+        if (btAdapter == null) {
+            // Bluetooth not supported on this platform.
+            return false;
+        }
+
         int profileConnectionState;
         profileConnectionState = btAdapter.getProfileConnectionState(
                 android.bluetooth.BluetoothProfile.HEADSET);