Replace system IO calls in chromecast/crash with Chrome utilities.

chromecast/crash/linux/dummy_minidump_generator.h

Index: chromecast/crash/linux/dummy_minidump_generator.h
diff --git a/chromecast/crash/linux/dummy_minidump_generator.h b/chromecast/crash/linux/dummy_minidump_generator.h
index eb0312500357615dba713625522bc746dc9e5e49..5eabca8039bf704d070889518b4f4f6dbd5f2372 100644
--- a/chromecast/crash/linux/dummy_minidump_generator.h
+++ b/chromecast/crash/linux/dummy_minidump_generator.h
@@ -21,22 +21,12 @@ class DummyMinidumpGenerator : public MinidumpGenerator {
   explicit DummyMinidumpGenerator(const std::string& existing_minidump_path);
 
   // MinidumpGenerator implementation:
+  // Moves the minidump located at |existing_minidump_path_| to |minidump_path|.
+  // Returns true if successful, false otherwise. Note that this function MUST
+  // be called on a thread without IO restrictions, or it will fail fatally.
   bool Generate(const std::string& minidump_path) override;
 
-  // Provide access to internal utility for testing.
-  bool CopyAndDeleteForTest(const std::string& dest_path) {
-    return CopyAndDelete(dest_path);
-  }
-
  private:
-  // Copies the contents of the file at |existing_minidump_path_| to the file at
-  // |dest_path|. If the copy operation succeeds, delete the file at
-  // |existing_minidump_path_|. Returns false if |existing_minidump_path_| can't
-  // be opened, or if the copy operation fails. Ideally, we would use Chrome
-  // utilities for a task like this, but we must ensure that this operation can
-  // occur on any thread (regardless of IO restrictions).
-  bool CopyAndDelete(const std::string& dest_path);
-
   const std::string existing_minidump_path_;
 
   DISALLOW_COPY_AND_ASSIGN(DummyMinidumpGenerator);