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_baannot.cpp b/fpdfsdk/cpdfsdk_baannot.cpp
index 9f21d3c..711d228 100644
--- a/fpdfsdk/cpdfsdk_baannot.cpp
+++ b/fpdfsdk/cpdfsdk_baannot.cpp
@@ -101,7 +101,7 @@
   m_pAnnot->ClearCachedAP();
 }
 
-void CPDFSDK_BAAnnot::SetContents(const CFX_WideString& sContents) {
+void CPDFSDK_BAAnnot::SetContents(const WideString& sContents) {
   if (sContents.IsEmpty()) {
     m_pAnnot->GetAnnotDict()->RemoveFor("Contents");
   } else {
@@ -110,11 +110,11 @@
   }
 }
 
-CFX_WideString CPDFSDK_BAAnnot::GetContents() const {
+WideString CPDFSDK_BAAnnot::GetContents() const {
   return m_pAnnot->GetAnnotDict()->GetUnicodeTextFor("Contents");
 }
 
-void CPDFSDK_BAAnnot::SetAnnotName(const CFX_WideString& sName) {
+void CPDFSDK_BAAnnot::SetAnnotName(const WideString& sName) {
   if (sName.IsEmpty()) {
     m_pAnnot->GetAnnotDict()->RemoveFor("NM");
   } else {
@@ -123,13 +123,13 @@
   }
 }
 
-CFX_WideString CPDFSDK_BAAnnot::GetAnnotName() const {
+WideString CPDFSDK_BAAnnot::GetAnnotName() const {
   return m_pAnnot->GetAnnotDict()->GetUnicodeTextFor("NM");
 }
 
 void CPDFSDK_BAAnnot::SetModifiedDate(const FX_SYSTEMTIME& st) {
   CPDFSDK_DateTime dt(st);
-  CFX_ByteString str = dt.ToPDFDateTimeString();
+  ByteString str = dt.ToPDFDateTimeString();
   if (str.IsEmpty())
     m_pAnnot->GetAnnotDict()->RemoveFor("M");
   else
@@ -138,7 +138,7 @@
 
 FX_SYSTEMTIME CPDFSDK_BAAnnot::GetModifiedDate() const {
   FX_SYSTEMTIME systime;
-  CFX_ByteString str = m_pAnnot->GetAnnotDict()->GetStringFor("M");
+  ByteString str = m_pAnnot->GetAnnotDict()->GetStringFor("M");
   CPDFSDK_DateTime dt(str);
   dt.ToSystemTime(systime);
   return systime;
@@ -153,14 +153,14 @@
   return m_pAnnot->GetAnnotDict()->GetIntegerFor("F");
 }
 
-void CPDFSDK_BAAnnot::SetAppState(const CFX_ByteString& str) {
+void CPDFSDK_BAAnnot::SetAppState(const ByteString& str) {
   if (str.IsEmpty())
     m_pAnnot->GetAnnotDict()->RemoveFor("AS");
   else
     m_pAnnot->GetAnnotDict()->SetNewFor<CPDF_String>("AS", str, false);
 }
 
-CFX_ByteString CPDFSDK_BAAnnot::GetAppState() const {
+ByteString CPDFSDK_BAAnnot::GetAppState() const {
   return m_pAnnot->GetAnnotDict()->GetStringFor("AS");
 }
 
@@ -225,7 +225,7 @@
 BorderStyle CPDFSDK_BAAnnot::GetBorderStyle() const {
   CPDF_Dictionary* pBSDict = m_pAnnot->GetAnnotDict()->GetDictFor("BS");
   if (pBSDict) {
-    CFX_ByteString sBorderStyle = pBSDict->GetStringFor("S", "S");
+    ByteString sBorderStyle = pBSDict->GetStringFor("S", "S");
     if (sBorderStyle == "S")
       return BorderStyle::SOLID;
     if (sBorderStyle == "D")