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

src/common/linux/file_id.h

Index: src/common/linux/file_id.h
diff --git a/src/common/linux/file_id.h b/src/common/linux/file_id.h
index 2642722a630515bbea11f2818d3cd656362f0780..1146d6ca530d529a7ff1175e4e4dc6b83cadfc43 100644
--- a/src/common/linux/file_id.h
+++ b/src/common/linux/file_id.h
@@ -37,10 +37,13 @@
 #include <string>
 
 #include "common/linux/guid_creator.h"
+#include "common/memory.h"
 
 namespace google_breakpad {
 
-static const size_t kMDGUIDSize = sizeof(MDGUID);
+// GNU binutils' ld defaults to 'sha1', which is 160 bits == 20 bytes,
+// so this is enough to fit that, which most binaries will use.
+static const size_t kDefaultBuildIdSize = 20;
 
 class FileID {
  public:
@@ -48,25 +51,25 @@ class FileID {
   ~FileID() {}
 
   // Load the identifier for the elf file path specified in the constructor into
-  // |identifier|.  Return false if the identifier could not be created for the
-  // file.
+  // |identifier|.
+  //
   // The current implementation will look for a .note.gnu.build-id
   // section and use that as the file id, otherwise it falls back to
   // XORing the first 4096 bytes of the .text section to generate an identifier.
-  bool ElfFileIdentifier(uint8_t identifier[kMDGUIDSize]);
+  bool ElfFileIdentifier(wasteful_vector<uint8_t>& identifier);
 
   // Load the identifier for the elf file mapped into memory at |base| into
-  // |identifier|.  Return false if the identifier could not be created for the
+  // |identifier|. Return false if the identifier could not be created for this
   // file.
-  static bool ElfFileIdentifierFromMappedFile(const void* base,
-                                              uint8_t identifier[kMDGUIDSize]);
+  static bool ElfFileIdentifierFromMappedFile(
+      const void* base,
+      wasteful_vector<uint8_t>& identifier);
 
   // Convert the |identifier| data to a NULL terminated string.  The string will
-  // be formatted as a UUID (e.g., 22F065BB-FC9C-49F7-80FE-26A7CEBD7BCE).
-  // The |buffer| should be at least 37 bytes long to receive all of the data
-  // and termination.  Shorter buffers will contain truncated data.
-  static void ConvertIdentifierToString(const uint8_t identifier[kMDGUIDSize],
-                                        char* buffer, int buffer_length);
+  // be formatted as a UUID in all uppercase without dashes.
+  // (e.g., 22F065BBFC9C49F780FE26A7CEBD7BCE).
+  static std::string ConvertIdentifierToUUIDString(
+      const wasteful_vector<uint8_t>& identifier);
 
  private:
   // Storage for the path specified