General cleanup on AppRTC Android Demo codebase

webrtc/examples/androidapp/src/org/appspot/apprtc/CpuMonitor.java

 /*
  *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 34 matching lines @@
  * practice.)
  *
  * <p>Caveats:
  *   o No provision made for zany "turbo" mode, common in the x86 world.
  *   o No provision made for ARM big.LITTLE; if CPU n can switch behind our
  *     back, we might get incorrect estimates.
  *   o This is not thread-safe.  To call asynchronously, create different
  *     CpuMonitor objects.
  *
  * <p>If we can gather enough info to generate a sensible result,
- * sampleCpuUtilization returns true.  It is designed to never through an
+ * sampleCpuUtilization returns true.  It is designed to never throw an
  * exception.
  *
  * <p>sampleCpuUtilization should not be called too often in its present form,
  * since then deltas would be small and the percent values would fluctuate and
  * be unreadable. If it is desirable to call it more often than say once per
  * second, one would need to increase SAMPLE_SAVE_NUMBER and probably use
  * Queue<Integer> to avoid copying overhead.
  *
  * <p>Known problems:
  *   1. Nexus 7 devices running Kitkat have a kernel which often output an
@@ skipping 437 matching lines @@
     } catch (FileNotFoundException e) {
       Log.e(TAG, "Cannot open /proc/stat for reading", e);
       return null;
     } catch (IOException e) {
       Log.e(TAG, "Problems reading /proc/stat", e);
       return null;
     }
     return new ProcStat(userTime, systemTime, idleTime);
   }
 }