Convert string class names

Automated using git grep & sed.
Replace StringC classes with StringView classes.
Remove the CFX_ prefix and put string classes in fxcrt namespace.
Change AsStringC() to AsStringView().
Rename tests from TEST(fxcrt, *String*Foo) to TEST(*String*,
Foo).
Couple of tests needed to have their names regularlized.

BUG=pdfium:894

Change-Id: I7ca038685c8d803795f3ed02545124f7a224c83d
Reviewed-on: https://pdfium-review.googlesource.com/14151
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_annothandlermgr.cpp b/fpdfsdk/cpdfsdk_annothandlermgr.cpp
index a1ac14c..2966b4d 100644
--- a/fpdfsdk/cpdfsdk_annothandlermgr.cpp
+++ b/fpdfsdk/cpdfsdk_annothandlermgr.cpp
@@ -76,14 +76,13 @@
   GetAnnotHandler(pAnnot)->OnLoad(pAnnot);
 }
 
-CFX_WideString CPDFSDK_AnnotHandlerMgr::Annot_GetSelectedText(
+WideString CPDFSDK_AnnotHandlerMgr::Annot_GetSelectedText(
     CPDFSDK_Annot* pAnnot) {
   return GetAnnotHandler(pAnnot)->GetSelectedText(pAnnot);
 }
 
-void CPDFSDK_AnnotHandlerMgr::Annot_ReplaceSelection(
-    CPDFSDK_Annot* pAnnot,
-    const CFX_WideString& text) {
+void CPDFSDK_AnnotHandlerMgr::Annot_ReplaceSelection(CPDFSDK_Annot* pAnnot,
+                                                     const WideString& text) {
   GetAnnotHandler(pAnnot)->ReplaceSelection(pAnnot, text);
 }