Move code in components/safe_browsing_db and chrome/browser/s_b/ under the safe_browsing namespace.

chrome/browser/safe_browsing/safe_browsing_store_file.h

Index: chrome/browser/safe_browsing/safe_browsing_store_file.h
diff --git a/chrome/browser/safe_browsing/safe_browsing_store_file.h b/chrome/browser/safe_browsing/safe_browsing_store_file.h
index bbe22fa812368d9be0e48bf2eabd03d85c43edf4..4d59bc435427316d9e7b5c36ccd8b7f8061f17b0 100644
--- a/chrome/browser/safe_browsing/safe_browsing_store_file.h
+++ b/chrome/browser/safe_browsing/safe_browsing_store_file.h
@@ -15,6 +15,8 @@
 #include "base/files/scoped_file.h"
 #include "base/sequenced_task_runner.h"
 
+namespace safe_browsing {
+
 // Implement SafeBrowsingStore in terms of a flat file.  The file
 // format is pretty literal:
 //
@@ -154,7 +156,7 @@ class SafeBrowsingStoreFile : public SafeBrowsingStore {
 
   bool BeginUpdate() override;
   bool FinishUpdate(
-      safe_browsing::PrefixSetBuilder* builder,
+      PrefixSetBuilder* builder,
       std::vector<SBAddFullHash>* add_full_hashes_result) override;
   bool CancelUpdate() override;
 
@@ -189,7 +191,7 @@ class SafeBrowsingStoreFile : public SafeBrowsingStore {
 
   // Does the actual update for FinishUpdate(), so that FinishUpdate() can clean
   // up correctly in case of error.
-  virtual bool DoUpdate(safe_browsing::PrefixSetBuilder* builder,
+  virtual bool DoUpdate(PrefixSetBuilder* builder,
                         std::vector<SBAddFullHash>* add_full_hashes_result);
 
   // Some very lucky users have an original-format file still in their
@@ -279,4 +281,6 @@ class SafeBrowsingStoreFile : public SafeBrowsingStore {
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingStoreFile);
 };
 
+}  // namespace safe_browsing
+
 #endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_STORE_FILE_H_