Change visibility of the destructor to public.

PlatformTest's destructor was set as protected, though the parent class
testing::Test declares it public.

BUG=none


Review URL: https://chromiumcodereview.appspot.com/11038058

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@161352 0039d316-1c4b-4281-b951-d872f2087c98

testing/platform_test.h

@@ -20,9 +20,11 @@ class NSAutoreleasePool;
 // implemented on the Mac.  To enable this for another platform, just adjust
 // the #ifdefs and add a platform_test_<platform>.cc implementation file.
 class PlatformTest : public testing::Test {
+ public:
+  virtual ~PlatformTest();
+
  protected:
   PlatformTest();
-  virtual ~PlatformTest();
 
  private:
   NSAutoreleasePool* pool_;