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..e935de9d570882ed42d6c9f35c91afd2d3a1c904 100644
--- a/components/chrome_cleaner/public/interfaces/chrome_prompt.mojom
+++ b/components/chrome_cleaner/public/interfaces/chrome_prompt.mojom
@@ -4,7 +4,14 @@
 
 module chrome_cleaner.mojom;
 
-import "mojo/common/file_path.mojom";
+// IMPORTANT NOTE: Avoid adding dependencies to typemapped .mojom files.
+// Enabling typemaps currently (as of July 2017) requires indirectly depending
+// on all existing typemap definitions. The Chrome Cleaner is built
+// independently from Chromium and would like to avoid these dependencies.
+
+// Once it's possible to specify a limited subset of typemaps to use, be
+// careful not to add dependencies to [Native] mojo structures. The wire format
+// for [Native] structs is not guaranteed to be consistent between versions.
 
 [Extensible]
 enum PromptAcceptance {
@@ -21,6 +28,10 @@ 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 +40,6 @@ 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);
 };