Bug 932278 - Remove the long-defunct gfxPlatform::UseReusableTileStore. r=BenWa

gfx/thebes/gfxPlatform.cpp

@@ -1575,22 +1575,6 @@ gfxPlatform::GetLowPrecisionResolution()
     return sLowPrecisionResolution;
 }
 
-bool
-gfxPlatform::UseReusableTileStore()
-{
-    static bool sUseReusableTileStore;
-    static bool sUseReusableTileStorePrefCached = false;
-
-    if (!sUseReusableTileStorePrefCached) {
-        sUseReusableTileStorePrefCached = true;
-        mozilla::Preferences::AddBoolVarCache(&sUseReusableTileStore,
-                                              "layers.reuse-invalid-tiles",
-                                              false);
-    }
-
-    return sUseReusableTileStore;
-}
-
 bool
 gfxPlatform::OffMainThreadCompositingEnabled()
 {

gfx/thebes/gfxPlatform.h

@@ -489,10 +489,6 @@ public:
     // Retrieve the resolution that a low precision buffer should render at.
     static float GetLowPrecisionResolution();
 
-    // Retain some invalid tiles when the valid region of a layer changes and
-    // excludes previously valid tiles.
-    static bool UseReusableTileStore();
-
     static bool OffMainThreadCompositingEnabled();
 
     /** Use gfxPlatform::GetPref* methods instead of direct calls to Preferences