breakpad: fix unittest errors

src/client/linux/handler/exception_handler_unittest.cc

Index: src/client/linux/handler/exception_handler_unittest.cc
diff --git a/src/client/linux/handler/exception_handler_unittest.cc b/src/client/linux/handler/exception_handler_unittest.cc
index 4eb7b73c74fcf9d522a9c76fe03bafdcc4954e88..17d84cf7be4d2fde44f560f129b1bc39b432d776 100644
--- a/src/client/linux/handler/exception_handler_unittest.cc
+++ b/src/client/linux/handler/exception_handler_unittest.cc
@@ -93,10 +93,6 @@ void FlushInstructionCache(const char* memory, uint32_t memory_size) {
 #endif
 }
 
-// Length of a formatted GUID string =
-// sizeof(MDGUID) * 2 + 4 (for dashes) + 1 (null terminator)
-const int kGUIDStringSize = 37;
-
 void sigchld_handler(int signo) { }
 
 int CreateTMPFile(const string& dir, string* path) {