Remove "master" from lua files

Bug: chromium:1101491
Bug: b/161896447

Change-Id: I68f7f0ed65ac94550b167328e70d7bdb25a60189
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305964
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>

resources/lua/slides.lua

@@ -46,22 +46,22 @@ function stroke_rect(canvas, rect, color)
     canvas:drawRect(rect, paint)
 end
 
-function drawSlide(canvas, slide, master_template)
+function drawSlide(canvas, slide, main_template)
 
     if #slide == 1 then
-        template = master_template.title
+        template = main_template.title
         canvas:drawText(slide[1].text, 320, 240, template[1])
         return
     end
 
-    template = master_template.slide
+    template = main_template.slide
 
     local x = template.margin_x
     local y = template.margin_y
     local scale = 1.25
 
     if slide.blockstyle == "code" then
-        local paint = master_template.codePaint
+        local paint = main_template.codePaint
         local fm = paint:getFontMetrics()
         local height = #slide * (fm.descent - fm.ascent)
         y = (480 - height) / 2

tools/lua/ngrams.lua

@@ -16,9 +16,9 @@ local n = 3
 -- CHANGEME
 
 -- This algorithm uses a list-of-lists for each SKP. For API call, append a
--- list containing just the verb to the master list. Then, backtrack over the
--- last (n-1) sublists in the master list and append the verb to those
--- sublists. At the end of execution, the master list contains a sublist for
+-- list containing just the verb to the main list. Then, backtrack over the
+-- last (n-1) sublists in the main list and append the verb to those
+-- sublists. At the end of execution, the main list contains a sublist for
 -- every verb in the SKP file. Each sublist has length n, with the exception of
 -- the last n-1 sublists, which are discarded in the summarize() function,
 -- which generates counts for each n-gram.