Remove wtf/atomics.h.

Bug: 736037
Change-Id: Ic43002666a0d33296b86b16400590f43ec628ea4
Reviewed-on: https://chromium-review.googlesource.com/c/1372233Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615589}

third_party/blink/renderer/modules/webdatabase/database.cc

@@ -53,7 +53,6 @@
 #include "third_party/blink/renderer/platform/cross_thread_functional.h"
 #include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
 #include "third_party/blink/renderer/platform/waitable_event.h"
-#include "third_party/blink/renderer/platform/wtf/atomics.h"
 
 // Registering "opened" databases with the DatabaseTracker
 // =======================================================

third_party/blink/renderer/platform/heap/heap.h

@@ -47,7 +47,6 @@
 #include "third_party/blink/renderer/platform/wtf/address_sanitizer.h"
 #include "third_party/blink/renderer/platform/wtf/allocator.h"
 #include "third_party/blink/renderer/platform/wtf/assertions.h"
-#include "third_party/blink/renderer/platform/wtf/atomics.h"
 #include "third_party/blink/renderer/platform/wtf/forward.h"
 
 namespace blink {

third_party/blink/renderer/platform/heap/page_memory.cc

@@ -9,7 +9,6 @@
 #include "third_party/blink/renderer/platform/heap/heap.h"
 #include "third_party/blink/renderer/platform/wtf/address_sanitizer.h"
 #include "third_party/blink/renderer/platform/wtf/assertions.h"
-#include "third_party/blink/renderer/platform/wtf/atomics.h"
 
 namespace blink {
 

third_party/blink/renderer/platform/wtf/BUILD.gn

@@ -55,7 +55,6 @@ jumbo_component("wtf") {
     "ascii_ctype.h",
     "assertions.cc",
     "assertions.h",
-    "atomics.h",
     "bit_vector.cc",
     "bit_vector.h",
     "bloom_filter.h",