[Downloads] Introduce GUIDs for downloads.

components/test/data/history/history.29.sql

Index: components/test/data/history/history.29.sql
diff --git a/components/test/data/history/history.28.sql b/components/test/data/history/history.29.sql
similarity index 94%
copy from components/test/data/history/history.28.sql
copy to components/test/data/history/history.29.sql
index d1356d46088f63b6f6ee27b7d43f6ae3159d0f3c..71611639030c01d42ab8aed187d2e1d62f3e11fc 100644
--- a/components/test/data/history/history.28.sql
+++ b/components/test/data/history/history.29.sql
@@ -1,13 +1,13 @@
 PRAGMA foreign_keys=OFF;
 BEGIN TRANSACTION;
 CREATE TABLE meta(key LONGVARCHAR NOT NULL UNIQUE PRIMARY KEY, value LONGVARCHAR);
-INSERT INTO "meta" VALUES('version','28');
+INSERT INTO "meta" VALUES('version','29');
 INSERT INTO "meta" VALUES('last_compatible_version','16');
 CREATE TABLE urls(id INTEGER PRIMARY KEY,url LONGVARCHAR,title LONGVARCHAR,visit_count INTEGER DEFAULT 0 NOT NULL,typed_count INTEGER DEFAULT 0 NOT NULL,last_visit_time INTEGER NOT NULL,hidden INTEGER DEFAULT 0 NOT NULL,favicon_id INTEGER DEFAULT 0 NOT NULL);
 CREATE TABLE visits(id INTEGER PRIMARY KEY,url INTEGER NOT NULL,visit_time INTEGER NOT NULL,from_visit INTEGER,transition INTEGER DEFAULT 0 NOT NULL,segment_id INTEGER,visit_duration INTEGER DEFAULT 0 NOT NULL);
 CREATE TABLE visit_source(id INTEGER PRIMARY KEY,source INTEGER NOT NULL);
 CREATE TABLE keyword_search_terms (keyword_id INTEGER NOT NULL,url_id INTEGER NOT NULL,lower_term LONGVARCHAR NOT NULL,term LONGVARCHAR NOT NULL);
-CREATE TABLE downloads (id INTEGER PRIMARY KEY,current_path LONGVARCHAR NOT NULL,target_path LONGVARCHAR NOT NULL,start_time INTEGER NOT NULL,received_bytes INTEGER NOT NULL,total_bytes INTEGER NOT NULL,state INTEGER NOT NULL,danger_type INTEGER NOT NULL, interrupt_reason INTEGER NOT NULL,end_time INTEGER NOT NULL,opened INTEGER NOT NULL,referrer VARCHAR NOT NULL,by_ext_id VARCHAR NOT NULL,by_ext_name VARCHAR NOT NULL,etag VARCHAR NOT NULL,last_modified VARCHAR NOT NULL);
+CREATE TABLE downloads (id INTEGER PRIMARY KEY,current_path LONGVARCHAR NOT NULL,target_path LONGVARCHAR NOT NULL,start_time INTEGER NOT NULL,received_bytes INTEGER NOT NULL,total_bytes INTEGER NOT NULL,state INTEGER NOT NULL,danger_type INTEGER NOT NULL, interrupt_reason INTEGER NOT NULL,end_time INTEGER NOT NULL,opened INTEGER NOT NULL,referrer VARCHAR NOT NULL,by_ext_id VARCHAR NOT NULL,by_ext_name VARCHAR NOT NULL,etag VARCHAR NOT NULL,last_modified VARCHAR NOT NULL, mime_type VARCHAR NOT NULL, original_mime_type VARCHAR NOT NULL);
 CREATE TABLE downloads_url_chains (id INTEGER NOT NULL,chain_index INTEGER NOT NULL,url LONGVARCHAR NOT NULL, PRIMARY KEY (id, chain_index) );
 CREATE TABLE segments (id INTEGER PRIMARY KEY,name VARCHAR,url_id INTEGER NON NULL);
 CREATE TABLE segment_usage (id INTEGER PRIMARY KEY,segment_id INTEGER NOT NULL,time_slot INTEGER NOT NULL,visit_count INTEGER DEFAULT 0 NOT NULL);