[code coverage] Check for coverage build before removing default deps.

This fixes link-time undefined symbol errors that occur because the
Clang profiling runtime uses symbols from the C runtime.

Bug: 1020445
Change-Id: Ic7b1f9cb970ff26592a934675ee5bc204249f4db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896238Reviewed-by: Tien Mai <tienmai@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713282}

chrome/credential_provider/eventlog/BUILD.gn

@@ -28,7 +28,7 @@ shared_library("gcp_eventlog_provider") {
     "gcp_eventlog_provider.cc",
   ]
 
-  if (!is_asan) {
+  if (!is_asan && !use_clang_coverage) {
     no_default_deps = true
     ldflags = [ "/NOENTRY" ]
   }