Revert "Add dbghelp.dll to delay load list"

This reverts commit 4edc0503.

Reason for revert: Breaks minidump generation on Windows

Original change's description:
> Add dbghelp.dll to delay load list
>
> Currently, many of the binaries have a static dependency on dbghelp.dll.
> This results in dbghelp getting loaded in all chrome processes. Upon
> inspection, dbghelp.dll is only necessary for stack sampling and mini
> dump handing in crashpad. Stack sampling is only enabled by default on
> unofficial builds of dev and canary.  All other times we are needlessly
> loading this module which brings in 300k of image file refset and 60k
> of Copy on Write costs per process.  This change adds it to the delay
> load list.
>
> Change-Id: I13da0ce0735431c5c51cdbc9ba2cfea0cc3cded7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336541
> Commit-Queue: Chris Davis <chrdavis@microsoft.com>
> Reviewed-by: Cliff Smolinsky <cliffsmo@microsoft.com>
> Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#796707}

TBR=thakis@chromium.org,brucedawson@chromium.org,cliffsmo@microsoft.com,chrdavis@microsoft.com

Change-Id: I6051562e22eaa9e778b7077c3efab1129bdfd77c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350744
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797080}

build/config/win/BUILD.gn

@@ -386,7 +386,6 @@ config("delayloads") {
     "/DELAYLOAD:cryptui.dll",
     "/DELAYLOAD:d3d11.dll",
     "/DELAYLOAD:d3d9.dll",
-    "/DELAYLOAD:dbghelp.dll",
     "/DELAYLOAD:dwmapi.dll",
     "/DELAYLOAD:dxgi.dll",
     "/DELAYLOAD:dxva2.dll",
@@ -424,6 +423,7 @@ config("delayloads_not_for_child_dll") {
   ldflags = [
     "/DELAYLOAD:advapi32.dll",
     "/DELAYLOAD:crypt32.dll",
+    "/DELAYLOAD:dbghelp.dll",
     "/DELAYLOAD:dhcpcsvc.dll",
     "/DELAYLOAD:dwrite.dll",
     "/DELAYLOAD:iphlpapi.dll",

chrome/test/delayload/delayloads_unittest.cc

@@ -96,6 +96,7 @@ TEST_F(DelayloadsTest, ChromeDllDelayloadsCheck) {
     "DWrite.dll",
     "ADVAPI32.dll",
     "CRYPT32.dll",
+    "dbghelp.dll",
     "dhcpcsvc.DLL",
     "IPHLPAPI.DLL",
     "ntdll.dll",