logs: change max_read_size_ from int64_t to size_t

Doing this to match other sizes and lengths it is compared with.

Bug: 1150460
Change-Id: If20ecddb55527ca603a86dc9db2ba3a3a5f7ebcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568375Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Commit-Queue: Adrian Elder <aelder@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832550}

chrome/browser/chromeos/system_logs/single_log_file_log_source.cc

@@ -28,7 +28,7 @@ constexpr int kMaxNumAllowedLogRotationsDuringFileRead = 3;
 // responsible for further bundling and truncating.
 //  * This cap is applied to the read buffer before dropping trailing incomplete
 //    lines.
-constexpr int64_t kMaxReadSize = 5 * 1024 * 1024;
+constexpr size_t kMaxReadSize = 5 * 1024 * 1024;
 
 // A custom timestamp for when the current Chrome session started. Used during
 // testing to override the actual time.
@@ -117,7 +117,7 @@ void SingleLogFileLogSource::Fetch(SysLogsSourceCallback callback) {
 }
 
 void SingleLogFileLogSource::SetMaxReadSizeForTesting(
-    const int64_t max_read_size) {
+    const size_t max_read_size) {
   max_read_size_ = max_read_size;
 }
 

chrome/browser/chromeos/system_logs/single_log_file_log_source.h

@@ -59,7 +59,7 @@ class SingleLogFileLogSource : public SystemLogsSource {
   // system_logs::SystemLogsSource:
   void Fetch(SysLogsSourceCallback callback) override;
 
-  void SetMaxReadSizeForTesting(int64_t max_read_size);
+  void SetMaxReadSizeForTesting(size_t max_read_size);
 
  private:
   friend class SingleLogFileLogSourceTest;
@@ -104,7 +104,7 @@ class SingleLogFileLogSource : public SystemLogsSource {
   base::FilePath log_file_dir_path_;
 
   // The maximum size of a read from |file_|.
-  int64_t max_read_size_;
+  size_t max_read_size_;
 
   // Keeps track of how much data has been read or skipped from |file_|.
   size_t file_cursor_position_;