chore: bump chromium to 7d4ac110045b7647fa8a81f5f0709 (master) (#24970)

* chore: bump chromium in DEPS to 760c905ccca34d8ed83c54f6a42c42a375792a6b

* chore: update patches

- Introduce WebContentsObserverList to encapsulate common behaviour
  2343269
- DumpAccTree mac testing: refactor tree formatter logic to make it
suitable for nested attribute calls
  2274545
- Fix FontPlatformDataMacTest.VariableOpticalSizingThreshold for Big Sur
  2351299

* chore: bump chromium in DEPS to b04584161e07d4ac110045b7647fa8a81f5f0709

* chore: update patches

* [printing] Move printing::MarginType to //printing/mojom/print.mojom

2341222

Co-authored-by: deepak1556 <hop2deep@gmail.com>

patches/chromium/add_contentgpuclient_precreatemessageloop_callback.patch

@@ -10,7 +10,7 @@ Allows Electron to restore WER when ELECTRON_DEFAULT_ERROR_MODE is set.
 This should be upstreamed.
 
 diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
-index 1caf9d56e76f47c42cff9e9515d5fcbc77a88d67..8b135d38c2e3604509882a15193dc8b031eeb1c2 100644
+index ed134d1d40fb23808a4cc251be50a7fbd833b49b..5aaf2356cc2c0fec9a90f3201f1e16553c69a5e3 100644
 --- a/content/gpu/gpu_main.cc
 +++ b/content/gpu/gpu_main.cc
 @@ -255,6 +255,10 @@ int GpuMain(const MainFunctionParams& parameters) {