Bug 910517 (3rd attempt) - Remove nsIMemoryReporter, and rename nsIMemoryMultiReporter as nsIMemoryReporter.  r=mmcr8.

--HG--
rename : content/canvas/src/WebGLMemoryMultiReporterWrapper.h => content/canvas/src/WebGLMemoryReporterWrapper.h
extra : rebase_source : 2b2a1b2667d6562fcf803ec48b4a8c10fdd519a3