Update to Chromium version 76.0.3809.0 (#665002)

OSR tests will be fixed by a follow-up merge of Viz support (see issue #2575).

patch/patch.cfg

@@ -441,14 +441,24 @@ patches = [
     'name': 'remove_component_build_check',
   },
   {
-    # Fix CompositorFrameReportingController usage of DCHECK_NE to compare
-    # unique_ptr types.
-    # https://chromium-review.googlesource.com/c/chromium/src/+/1584292
-    'name': 'compositor_frame_reporting_controller_1584292',
+    # Restore WebUrlLoader Cancel method.
+    # https://chromium-review.googlesource.com/c/chromium/src/+/1617042
+    'name': 'web_url_loader_cancel_1617042',
   },
   {
-    # Fix AssertContextWasntDestroyed due to pointer reuse.
-    # https://chromium-review.googlesource.com/c/chromium/src/+/1590418
-    'name': 'simple_dependency_manager_1590418',
-  }
+    # Avoid a shutdown crash with multi-threaded message loop caused by
+    # |g_browser_task_executor->browser_ui_thread_scheduler_| being null when
+    # BrowserTaskExecutor::Shutdown is called via CefContext::FinalizeShutdown.
+    # This crash was introduced by https://crrev.com/5f6212babf.
+    'name': 'browser_scheduler',
+  },
+  {
+    # Avoid a shutdown crash caused by PrefWatcher holding a reference to
+    # |g_browser_process->local_state()|, and the local_state being deleted
+    # before the PrefWatcher object (which is associated with a Profile).
+    # PrefWatcher::Shutdown will now be called from ChromeBrowserProcessStub::
+    # Shutdown for all Profiles before local_state deletion.
+    # This crash was introduced by https://crrev.com/7d032b378c.
+    'name': 'chrome_pref_watcher',
+    }
 ]