Switch the Linux minidump writer to use MDCVInfoELF for CV data.

src/client/linux/minidump_writer/minidump_writer_unittest.cc

Index: src/client/linux/minidump_writer/minidump_writer_unittest.cc
diff --git a/src/client/linux/minidump_writer/minidump_writer_unittest.cc b/src/client/linux/minidump_writer/minidump_writer_unittest.cc
index e1046e12a0b2d46e07fcf90485e2194e51b1cf3c..7a736641c9ac872a2892bdd59be58056494bda59 100644
--- a/src/client/linux/minidump_writer/minidump_writer_unittest.cc
+++ b/src/client/linux/minidump_writer/minidump_writer_unittest.cc
@@ -410,8 +410,9 @@ TEST(MinidumpWriterTest, DeletedBinary) {
   EXPECT_STREQ(binpath.c_str(), module->code_file().c_str());
   // Check that the file ID is correct.
   FileID fileid(helper_path.c_str());
-  uint8_t identifier[sizeof(MDGUID)];
-  EXPECT_TRUE(fileid.ElfFileIdentifier(identifier));
+  uint8_t identifier[kMaxBuildID];
+  size_t identifier_length;
+  EXPECT_TRUE(fileid.ElfFileIdentifier(identifier, &identifier_length));
   char identifier_string[kGUIDStringSize];
   FileID::ConvertIdentifierToString(identifier,
                                     identifier_string,