[Sync] Convert sync to a static library.

components/sync/base/sync_string_conversions.h

Index: components/sync/base/sync_string_conversions.h
diff --git a/components/sync/base/sync_string_conversions.h b/components/sync/base/sync_string_conversions.h
index 072ee654d1faac05e2e193700941aa9ce7f72028..c9f8d544c55e894e90d0c808c06b693dd6840eb7 100644
--- a/components/sync/base/sync_string_conversions.h
+++ b/components/sync/base/sync_string_conversions.h
@@ -5,19 +5,17 @@
 #ifndef COMPONENTS_SYNC_BASE_SYNC_STRING_CONVERSIONS_H_
 #define COMPONENTS_SYNC_BASE_SYNC_STRING_CONVERSIONS_H_
 
-#include "components/sync/base/sync_export.h"
 #include "components/sync/core/connection_status.h"
 #include "components/sync/core/sync_encryption_handler.h"
 
 namespace syncer {
 
-SYNC_EXPORT const char* ConnectionStatusToString(ConnectionStatus status);
+const char* ConnectionStatusToString(ConnectionStatus status);
 
 // Returns the string representation of a PassphraseRequiredReason value.
-SYNC_EXPORT const char* PassphraseRequiredReasonToString(
-    PassphraseRequiredReason reason);
+const char* PassphraseRequiredReasonToString(PassphraseRequiredReason reason);
 
-SYNC_EXPORT const char* PassphraseTypeToString(PassphraseType type);
+const char* PassphraseTypeToString(PassphraseType type);
 
 const char* BootstrapTokenTypeToString(BootstrapTokenType type);
 }  // namespace syncer