Fix clang warning for 'using namespace std' in a header file: PowerGadgetLib.h

Removed the 'using namespace std' directive from the header with using qualified
name for string as std::string.

TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/441083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287758 0039d316-1c4b-4281-b951-d872f2087c98

third_party/power_gadget/PowerGadgetLib.cpp

@@ -28,8 +28,6 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "PowerGadgetLib.h"
-#include <Windows.h>
-#include <string>
 #include <vector>
 
 using namespace std;

third_party/power_gadget/PowerGadgetLib.h

@@ -30,8 +30,6 @@
 #include <Windows.h>
 #include <string>
 
-using namespace std;
-
 typedef bool (*IPGInitialize) ();
 typedef bool (*IPGGetNumNodes) (int *nNodes);
 typedef bool (*IPGGetNumMsrs) (int *nMsr);
@@ -73,7 +71,7 @@ public:
 	bool GetPowerData(int iNode, int iMSR, double *results, int *nResult);
 	bool StartLog(wchar_t *szFilename);
 	bool StopLog();
-	string GetLastError();
+	std::string GetLastError();
 
 private:
 	IPGInitialize pInitialize;