Application: Do not indent forward declaration inside namespace.

  application/browser/application.h(27): Do not indent within a
  namespace [runtime/indentation_namespace] [4]
XWalkDevToolsServer: Reorder includes.

  runtime/browser/android/xwalk_dev_tools_server.h(9): Found C system
  header after C++ system header. Should be: xwalk_dev_tools_server.h, c
  system, c++ system, other. [build/include_order] [4]
Remove ; after function declaration.

  runtime/browser/media/media_capture_devices_dispatcher.cc(32):  You
  don't need a ; after a }  [readability/braces] [4]
Merge pull request #2380 from crosswalk-project/style-fixes

Fix some coding style issues.