Remove Chromium's built-in MemoryPressureMonitor OS-20756, OS-20753

We will use the new electron.memoryPressureMonitor to trigger
memory pressure events. Electron's memoryPressureMonitor propagates
events to render processes too. Remove our previous attempt where
we relied on Chromium's own LinuxMemoryPressureMonitor and launching
the monitor on both main and renderer processes.

Author: caneraltinbasak

patches/chromium/.patches

@@ -195,7 +195,6 @@ add_switch_to_disable_font_matching_cache_os-14352.patch
 fix_overlay_strategy_for_html_pages_with_transparency_os-19250.patch
 feat_nexus-window_implement_setopacity_support_for_nexus_platform.patch
 ozone_nexus_implement_setfullscreen_for_nexuswindow_os-19899.patch
-enable_memory_pressure_monitoring_and_enable_for_renderer_process.patch
 fix_wayland_window_call_setwindowgeometry_for_position_updates.patch
 add_mse_support_to_brightsign_video_player_os-19598.patch
 feat_enable_hls_support_when_brightsign_media_player_is_enabled.patch