Add BASE_API to SystemMonitor::PowerObserver to be able to

export net::HttpNetworkLayer

BUG=76997
TEST=NONE
Review URL: http://codereview.chromium.org/6992032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86492 0039d316-1c4b-4281-b951-d872f2087c98

base/system_monitor/system_monitor.h

@@ -66,7 +66,7 @@ class BASE_API SystemMonitor {
   // are finished. Observers should implement quick callback functions; if
   // lengthy operations are needed, the observer should take care to invoke
   // the operation on an appropriate thread.
-  class PowerObserver {
+  class BASE_API PowerObserver {
    public:
     // Notification of a change in power status of the computer, such
     // as from switching between battery and A/C power.