mac: Remove code to support OS X 10.10 in //components/metal_util

Bug: 1153883
Change-Id: Ieb2ee69ba93e0469cbe307dfb1f12687a0a1a702
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572379
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833778}

components/metal_util/device.mm

@@ -12,28 +12,23 @@
 namespace metal {
 
 MTLDevicePtr CreateDefaultDevice() {
-  if (@available(macOS 10.11, *)) {
-    // First attempt to find a low power device to use.
-    base::scoped_nsprotocol<id<MTLDevice>> device_to_use;
-    base::scoped_nsobject<NSArray<id<MTLDevice>>> devices(MTLCopyAllDevices());
-    for (id<MTLDevice> device in devices.get()) {
-      if ([device isLowPower]) {
-        device_to_use.reset(device, base::scoped_policy::RETAIN);
-        break;
-      }
+  // First attempt to find a low power device to use.
+  base::scoped_nsprotocol<id<MTLDevice>> device_to_use;
+  base::scoped_nsobject<NSArray<id<MTLDevice>>> devices(MTLCopyAllDevices());
+  for (id<MTLDevice> device in devices.get()) {
+    if ([device isLowPower]) {
+      device_to_use.reset(device, base::scoped_policy::RETAIN);
+      break;
     }
-    // Failing that, use the system default device.
-    if (!device_to_use)
-      device_to_use.reset(MTLCreateSystemDefaultDevice());
-    if (!device_to_use) {
-      DLOG(ERROR) << "Failed to find MTLDevice.";
-      return nullptr;
-    }
-    return device_to_use.release();
   }
-  // If no device was found, or if the macOS version is too old for Metal,
-  // return no context provider.
-  return nullptr;
+  // Failing that, use the system default device.
+  if (!device_to_use)
+    device_to_use.reset(MTLCreateSystemDefaultDevice());
+  if (!device_to_use) {
+    DLOG(ERROR) << "Failed to find MTLDevice.";
+    return nullptr;
+  }
+  return device_to_use.release();
 }
 
 }  // namespace metal

components/metal_util/test_shader.mm

@@ -697,8 +697,7 @@ base::ScopedDispatchObject<dispatch_data_t> GetLibraryData() {
 }
 
 // State shared between the compiler callback and the caller.
-class API_AVAILABLE(macos(10.11)) TestShaderState
-    : public base::RefCountedThreadSafe<TestShaderState> {
+class TestShaderState : public base::RefCountedThreadSafe<TestShaderState> {
  public:
   TestShaderState(TestShaderCallback callback,
                   TestShaderComponent component,