[inspector] removed warning suppression from BUILD.gn

All these warnings were fixed long time ago.

TBR=dgozman@chromium.org

Bug: none
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I066136ce685f95d07b7cbbb4efa8255f5aeaf1a8
Reviewed-on: https://chromium-review.googlesource.com/804816Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49808}

src/inspector/BUILD.gn

@@ -79,17 +79,6 @@ action("inspector_injected_script") {
 
 config("inspector_config") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
-  cflags = []
-  if (is_win) {
-    cflags += [
-      "/wd4267",  # Truncation from size_t to int.
-      "/wd4305",  # Truncation from 'type1' to 'type2'.
-      "/wd4324",  # Struct padded due to declspec(align).
-      "/wd4714",  # Function marked forceinline not inlined.
-      "/wd4800",  # Value forced to bool.
-      "/wd4996",  # Deprecated function call.
-    ]
-  }
   if (is_component_build) {
     defines = [ "BUILDING_V8_SHARED" ]
   }