Switch to simpler base::WriteFile() variants (62/N)

This CL is part of a batch of CLs to replace the use of the less
friendly base::WriteFile call with simpler variants, which are easier to
read, and less prone to mistakes.

Changes in this particular CL address files under the path
/chromecast/crash.

This CL was uploaded by git cl split.

R=dnicoara@chromium.org

AX-Relnotes: n/a.
Bug: 418837
Change-Id: I916b1ada29bc2e54f2f39e6177c63f6bb15c2077
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4288686
Auto-Submit: Claudio DeSouza <cdesouza@igalia.com>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1111031}

chromecast/crash/linux/dummy_minidump_generator_unittest.cc

@@ -34,8 +34,7 @@ TEST(DummyMinidumpGeneratorTest, GenerateSucceedsWithSmallSource) {
   // Create a fake minidump file.
   ScopedTempFile fake_minidump;
   const std::string data("Test contents of the minidump file.\n");
-  ASSERT_EQ(static_cast<int>(data.size()),
-            base::WriteFile(fake_minidump.path(), data.c_str(), data.size()));
+  ASSERT_TRUE(base::WriteFile(fake_minidump.path(), data));
 
   DummyMinidumpGenerator generator(fake_minidump.path().value());
   base::FilePath new_minidump = minidump_dir.GetPath().Append("minidump.dmp");
@@ -61,8 +60,7 @@ TEST(DummyMinidumpGeneratorTest, GenerateSucceedsWithLargeSource) {
   const std::string data = base::RandBytesAsString(str_len);
 
   // Write the string to the file.
-  ASSERT_EQ(static_cast<int>(data.size()),
-            base::WriteFile(fake_minidump.path(), data.c_str(), data.size()));
+  ASSERT_TRUE(base::WriteFile(fake_minidump.path(), data));
 
   base::FilePath new_minidump = minidump_dir.GetPath().Append("minidump.dmp");
   DummyMinidumpGenerator generator(fake_minidump.path().value());