Change ClientInfo into a class to match other platforms

src/client/mac/crash_generation/client_info.h

Index: src/client/mac/crash_generation/client_info.h
===================================================================
--- a/src/client/mac/crash_generation/client_info.h
+++ b/src/client/mac/crash_generation/client_info.h
@@ -27,17 +27,21 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef CLIENT_MAC_CRASH_GENERATION_CLIENT_INFO_H_
 #define CLIENT_MAC_CRASH_GENERATION_CLIENT_INFO_H_
 
 namespace google_breakpad {
 
-struct ClientInfo {
-  int exception_type;
-  int exception_code;
-  int exception_subcode;
+class ClientInfo {
+ public:
+  explicit ClientInfo(pid_t pid) : pid_(pid) {}
+
+  pid_t pid() const { return pid_; }
+
+ private:
+  pid_t pid_;
 };
 
 }  // namespace google_breakpad
 
 #endif  // CLIENT_MAC_CRASH_GENERATION_CLIENT_INFO_H_