[api] Remove the deprecated function EnsureEventLoopInitialized

This function has been deprecated for month by now.

R=ulan@chromium.org

Bug: v8:7754
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I19d1b41bad2849b7f3d4d6684dc6f0f80af081f0
Reviewed-on: https://chromium-review.googlesource.com/1144922Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54575}

include/libplatform/libplatform.h

@@ -62,11 +62,6 @@ V8_PLATFORM_EXPORT bool PumpMessageLoop(
     v8::Platform* platform, v8::Isolate* isolate,
     MessageLoopBehavior behavior = MessageLoopBehavior::kDoNotWait);
 
-V8_PLATFORM_EXPORT V8_DEPRECATED(
-    "This function has become obsolete and is essentially a nop",
-    void EnsureEventLoopInitialized(v8::Platform* platform,
-                                    v8::Isolate* isolate));
-
 /**
  * Runs pending idle tasks for at most |idle_time_in_seconds| seconds.
  *

src/libplatform/default-platform.cc

@@ -61,9 +61,6 @@ bool PumpMessageLoop(v8::Platform* platform, v8::Isolate* isolate,
                                                                   behavior);
 }
 
-void EnsureEventLoopInitialized(v8::Platform* platform, v8::Isolate* isolate) {
-}
-
 void RunIdleTasks(v8::Platform* platform, v8::Isolate* isolate,
                   double idle_time_in_seconds) {
   static_cast<DefaultPlatform*>(platform)->RunIdleTasks(isolate,