Enable ELF reader build id tests in non-official build

The build id flag was enabled in non-official builds in
https://crrev.com/776312. The tests depending on it can now be enabled
in that configuration.

Bug: 870919
Change-Id: I37e7bc2fbfad4b6df2126071652c4c5982e84e90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296263
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Mike Wittman <wittman@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788730}

base/debug/elf_reader_unittest.cc

@@ -19,10 +19,6 @@ extern char __executable_start;
 namespace base {
 namespace debug {
 
-// The linker flag --build-id is passed only on official builds and Fuchsia
-// builds.
-#if defined(OFFICIAL_BUILD) || defined(OS_FUCHSIA)
-
 #if defined(OFFICIAL_BUILD)
 constexpr size_t kExpectedBuildIdStringLength = 40;  // SHA1 hash in hex.
 #else
@@ -54,7 +50,6 @@ TEST(ElfReaderTest, ReadElfBuildIdLowercase) {
     EXPECT_TRUE(!IsAsciiAlpha(c) || IsAsciiLower(c));
   }
 }
-#endif  // defined(OFFICIAL_BUILD) || defined(OS_FUCHSIA)
 
 TEST(ElfReaderTest, ReadElfLibraryName) {
 #if defined(OS_ANDROID)