Rename fx_ge_linux.cpp to linux/fx_linux_impl.cpp

Make consistent with:
  core/fxge/android/fx_android_impl.cpp
  core/fxge/apple/fx_apple_impl.cpp
  core/fxge/win32/fx_win32_impl.cpp

Change-Id: I1054dac93cd321d2a7ba229f599a0ac5c3bfb91c
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/80010
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
diff --git a/core/fxge/BUILD.gn b/core/fxge/BUILD.gn
index bc58030..4a79bc8 100644
--- a/core/fxge/BUILD.gn
+++ b/core/fxge/BUILD.gn
@@ -161,7 +161,7 @@
   }
 
   if (is_linux || is_chromeos) {
-    sources += [ "fx_ge_linux.cpp" ]
+    sources += [ "linux/fx_linux_impl.cpp" ]
   }
 
   if (is_mac) {
diff --git a/core/fxge/fx_ge_linux.cpp b/core/fxge/linux/fx_linux_impl.cpp
similarity index 100%
rename from core/fxge/fx_ge_linux.cpp
rename to core/fxge/linux/fx_linux_impl.cpp