Remove unused BlinkPlatformImpl::main_thread_task_runner_

Bug: None
Change-Id: Icc2e54d85b33c0ddd5110fd5e3921503c2655a5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2291305
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787623}

content/child/blink_platform_impl.cc

@@ -155,17 +155,11 @@ class ThreadSafeBrowserInterfaceBrokerProxyImpl
 
 // TODO(skyostil): Ensure that we always have an active task runner when
 // constructing the platform.
-BlinkPlatformImpl::BlinkPlatformImpl()
-    : BlinkPlatformImpl(base::ThreadTaskRunnerHandle::IsSet()
-                            ? base::ThreadTaskRunnerHandle::Get()
-                            : nullptr,
-                        nullptr) {}
+BlinkPlatformImpl::BlinkPlatformImpl() : BlinkPlatformImpl(nullptr) {}
 
 BlinkPlatformImpl::BlinkPlatformImpl(
-    scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner)
-    : main_thread_task_runner_(std::move(main_thread_task_runner)),
-      io_thread_task_runner_(std::move(io_thread_task_runner)),
+    : io_thread_task_runner_(std::move(io_thread_task_runner)),
       browser_interface_broker_proxy_(
           base::MakeRefCounted<ThreadSafeBrowserInterfaceBrokerProxyImpl>()),
       native_theme_engine_(GetWebThemeEngine()) {}

content/child/blink_platform_impl.h

@@ -29,7 +29,6 @@ class CONTENT_EXPORT BlinkPlatformImpl : public blink::Platform {
  public:
   BlinkPlatformImpl();
   explicit BlinkPlatformImpl(
-      scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
   ~BlinkPlatformImpl() override;
 
@@ -63,7 +62,6 @@ class CONTENT_EXPORT BlinkPlatformImpl : public blink::Platform {
       const override;
 
  private:
-  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
   const scoped_refptr<blink::ThreadSafeBrowserInterfaceBrokerProxy>
       browser_interface_broker_proxy_;

content/renderer/renderer_blink_platform_impl.cc

@@ -159,14 +159,12 @@ gpu::ContextType ToGpuContextType(blink::Platform::ContextType type) {
 
 RendererBlinkPlatformImpl::RendererBlinkPlatformImpl(
     blink::scheduler::WebThreadScheduler* main_thread_scheduler)
-    : BlinkPlatformImpl(main_thread_scheduler->DefaultTaskRunner(),
-                        RenderThreadImpl::current()
+    : BlinkPlatformImpl(RenderThreadImpl::current()
                             ? RenderThreadImpl::current()->GetIOTaskRunner()
                             : nullptr),
       sudden_termination_disables_(0),
       is_locked_to_site_(false),
       main_thread_scheduler_(main_thread_scheduler) {
-
   // RenderThread may not exist in some tests.
   if (RenderThreadImpl::current()) {
 #if defined(OS_LINUX)
@@ -366,8 +364,8 @@ void RendererBlinkPlatformImpl::SuddenTerminationChanged(bool enabled) {
     // We should not get more enables than disables, but we want it to be a
     // non-fatal error if it does happen.
     DCHECK_GT(sudden_termination_disables_, 0);
-    sudden_termination_disables_ = std::max(sudden_termination_disables_ - 1,
-                                            0);
+    sudden_termination_disables_ =
+        std::max(sudden_termination_disables_ - 1, 0);
     if (sudden_termination_disables_ != 0)
       return;
   } else {
@@ -689,9 +687,8 @@ RendererBlinkPlatformImpl::GetVideoCaptureImplManager() {
 
 //------------------------------------------------------------------------------
 
-static void Collect3DContextInformation(
-    blink::Platform::GraphicsInfo* gl_info,
-    const gpu::GPUInfo& gpu_info) {
+static void Collect3DContextInformation(blink::Platform::GraphicsInfo* gl_info,
+                                        const gpu::GPUInfo& gpu_info) {
   DCHECK(gl_info);
   const gpu::GPUInfo::GPUDevice& active_gpu = gpu_info.active_gpu();
   gl_info->vendor_id = active_gpu.vendor_id;