Chrome Cleaner: Remove indirect base::FilePath mojo dependency.

components/chrome_cleaner/public/interfaces/chrome_prompt.mojom

Index: components/chrome_cleaner/public/interfaces/chrome_prompt.mojom
diff --git a/components/chrome_cleaner/public/interfaces/chrome_prompt.mojom b/components/chrome_cleaner/public/interfaces/chrome_prompt.mojom
index 07013fe06431897c6d0486f5d135eb8c1df37b3d..38f724414a2d35b5e6c8dcbaf12b062381e84353 100644
--- a/components/chrome_cleaner/public/interfaces/chrome_prompt.mojom
+++ b/components/chrome_cleaner/public/interfaces/chrome_prompt.mojom
@@ -4,7 +4,10 @@
 
 module chrome_cleaner.mojom;
 
-import "mojo/common/file_path.mojom";
+// IMPORTANT NOTE: Avoid adding dependencies to other .mojom files.
+// Since the Chrome Cleaner is built as a binary independent of Chrome, the
+// mojo interface between the two should contain only primitive types to avoid
+// type incompabilities as the binaries' versions diverge.
 
 [Extensible]
 enum PromptAcceptance {
@@ -21,6 +24,10 @@ enum PromptAcceptance {
   IGNORED = 4,
 };
 
+struct FilePath {
+  array<uint16> value;
+};
+
 // Service provided by Chrome to prompt the user to start a cleanup if the
 // Chrome Cleanup Tool detects unwanted software on the system.
 interface ChromePrompt {
@@ -29,6 +36,6 @@ interface ChromePrompt {
   //                         will be deleted by the Chrome Cleanup Tool.
   // Returns:
   //  - prompt_acceptance: indicates if the user accepted the prompt.
-  PromptUser(array<mojo.common.mojom.FilePath> files_to_delete)
+  PromptUser(array<FilePath> files_to_delete)
       => (PromptAcceptance prompt_acceptance);
 };