Revert "Make transport security state generation part of the build."

This reverts commit 6ee4f021.

Reason for revert: 
This breaks Chrome PFQ with error:
chromeos-chrome-59.0.3067.0_rc-r1: ../../../../../../../home/chrome-bot/chrome_root/src/third_party/binutils/Linux_x64/Release/bin/ld.gold: error: cannot find -latomic



Original change's description:
> Make transport security state generation part of the build.
> 
> This CL adds a build step to generate transport_security_state_static.h
> when required.
> 
> Bug:595493
> 
> Change-Id: I478137a40d9107cbcc6470ee544bda66823ebbff
> Reviewed-on: https://chromium-review.googlesource.com/471529
> Reviewed-by: Lucas Garron <lgarron@chromium.org>
> Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
> Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#463090}

TBR=rsleevi@chromium.org,peter@chromium.org,lgarron@chromium.org,martijn@martijnc.be,cbentzel+watch@chromium.org,net-reviews@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I84536c89c093531f1cf60cbdd4a3cfb2efbe5d80
Reviewed-on: https://chromium-review.googlesource.com/474009Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#463428}

net/BUILD.gn

@@ -354,7 +354,6 @@ component("net") {
     "//base",
     "//net/base/registry_controlled_domains",
     "//net/data/ssl/wosign:wosign_domains",
-    "//net/http:generate_transport_security_state",
     "//third_party/protobuf:protobuf_lite",
     "//url:url_features",
   ]

net/http/BUILD.gn

@@ -4,22 +4,6 @@
 
 import("//build/compiled_action.gni")
 
-compiled_action("generate_transport_security_state") {
-  tool = "//net/tools/transport_security_state_generator"
-
-  # Inputs in order expected by the command line of the tool.
-  inputs = [
-    "transport_security_state_static.json",
-    "transport_security_state_static.pins",
-    "transport_security_state_static.template",
-  ]
-  outputs = [
-    "$target_gen_dir/transport_security_state_static.h",
-  ]
-  args =
-      rebase_path(inputs, root_build_dir) + rebase_path(outputs, root_build_dir)
-}
-
 compiled_action_foreach("transport_security_state_unittest_data") {
   tool = "//net/tools/transport_security_state_generator"
   sources = [