Update to Chromium version 88.0.4324.0 (#827102)

- Mac: Xcode 12.2 and the MacOS 11.0 SDK are now required for building.
- MacOS 10.10 (Yosemite) is no longer supported (see https://crbug.com/1126056).
- Flash is no longer supported (see https://www.chromium.org/flash-roadmap).

patch/patches/linux_poll_2466.patch

@@ -1,5 +1,5 @@
 diff --git base/files/file_path_watcher_linux.cc base/files/file_path_watcher_linux.cc
-index 4e231b615e8f..a5100c0bf1c8 100644
+index 4e231b615e8f..ffb027ebb0a3 100644
 --- base/files/file_path_watcher_linux.cc
 +++ base/files/file_path_watcher_linux.cc
 @@ -5,6 +5,7 @@
@@ -18,7 +18,7 @@ index 4e231b615e8f..a5100c0bf1c8 100644
  #include <fstream>
  #include <map>
  #include <memory>
-@@ -263,8 +265,10 @@ void InotifyReaderThreadDelegate::ThreadMain() {
+@@ -263,19 +265,16 @@ void InotifyReaderThreadDelegate::ThreadMain() {
    PlatformThread::SetName("inotify_reader");
  
    // Make sure the file descriptors are good for use with select().
@@ -30,10 +30,10 @@ index 4e231b615e8f..a5100c0bf1c8 100644
 +  } };
  
    while (true) {
-     fd_set rfds;
-@@ -272,10 +276,9 @@ void InotifyReaderThreadDelegate::ThreadMain() {
-     FD_SET(inotify_fd_, &rfds);
- 
+-    fd_set rfds;
+-    FD_ZERO(&rfds);
+-    FD_SET(inotify_fd_, &rfds);
+-
      // Wait until some inotify events are available.
 -    int select_result =
 -        HANDLE_EINTR(select(inotify_fd_ + 1, &rfds, nullptr, nullptr, nullptr));